Not a type of the Payment and Settlement System:
The correct answer is option 'E' - Cryptocurrency.

Explanation:
Payment and Settlement System:
Payment and settlement systems are a vital part of any economy as they facilitate the smooth transfer of funds between individuals, businesses, and financial institutions. These systems ensure the timely and secure transfer of funds, which is essential for economic activities and financial stability.

Types of Payment and Settlement Systems:
1. National Electronic Funds Transfer (NEFT):
- NEFT is a payment system that facilitates one-to-one funds transfers.
- It operates on a Deferred Net Settlement (DNS) basis, where transactions are batched and settled periodically.
- NEFT transfers can be initiated through online banking, mobile apps, or by visiting a bank branch.

2. Immediate Payment Service (IMPS):
- IMPS is an instant interbank electronic fund transfer service.
- It allows customers to make real-time fund transfers using mobile phones, internet banking, ATMs, or bank branches.
- IMPS is available 24x7 and can be used for various types of transactions, including person-to-person, person-to-account, and person-to-merchant transfers.

3. Unified Payments Interface (UPI):
- UPI is a real-time payment system that enables users to link multiple bank accounts to a single mobile application.
- It allows users to make instant fund transfers, pay bills, and make merchant payments using a Virtual Payment Address (VPA) or scanning a QR code.
- UPI transfers can be initiated through various apps provided by banks or third-party service providers.

4. Bharat Bill Payment System (BBPS):
- BBPS is an integrated bill payment system that offers interoperable and accessible bill payment services to customers.
- It allows customers to pay their bills (electricity, water, gas, DTH, etc.) through multiple channels such as online platforms, mobile apps, bank branches, and ATMs.
- BBPS provides a single platform for billers to present bills and enables customers to pay them through multiple modes.

5. Cryptocurrency:
- Cryptocurrency, such as Bitcoin, Ethereum, and Litecoin, is a digital or virtual form of currency that uses cryptography for secure financial transactions.
- Unlike traditional payment systems, cryptocurrencies are decentralized and operate on a peer-to-peer network.
- While cryptocurrencies can be used for transactions, they are not classified as a type of payment and settlement system regulated by central banks or financial institutions.

In conclusion, while National Electronic Funds Transfer (NEFT), Immediate Payment Service (IMPS), Unified Payments Interface (UPI), and Bharat Bill Payment System (BBPS) are all types of payment and settlement systems, cryptocurrency is not classified as one.