The correct answer is option 'D', i.e., packet switched traffic.

Explanation:
Teleservices in GSM (Global System for Mobile Communications) refer to the different types of services that can be provided over the GSM network. These services include standard mobile telephony, mobile originated traffic, and base originated traffic. However, packet switched traffic does not come under the teleservices of GSM.

1. Standard Mobile Telephony:
Standard mobile telephony is the basic service provided by GSM. It allows users to make and receive voice calls using their mobile phones. This service is known as circuit-switched telephony, where dedicated channels are established between the calling and receiving parties.

2. Mobile Originated Traffic:
Mobile originated traffic refers to the data or information that is sent from a mobile device to another device or network. This includes services like SMS (Short Message Service), MMS (Multimedia Messaging Service), and mobile data services. These services allow users to send text messages, multimedia content, and access the internet on their mobile devices.

3. Base Originated Traffic:
Base originated traffic involves data or information that is sent from the GSM network's base station to a mobile device. This includes services like paging, broadcasting, and cell information updates. Paging is used to locate a mobile device when someone is trying to call or message it. Broadcasting is used to send information simultaneously to multiple mobile devices, such as weather alerts or emergency notifications. Cell information updates provide information about the network cells and their availability.

4. Packet Switched Traffic:
Packet switched traffic does not fall under the teleservices of GSM. Packet switching is a method of data transmission where data is divided into packets and sent over an IP-based network. This type of traffic is commonly used for internet-based services like browsing, email, and streaming. However, in GSM, packet switched traffic is not considered a teleservice as it is not directly related to circuit-switched telephony.

In conclusion, the teleservices of GSM include standard mobile telephony, mobile originated traffic, and base originated traffic, while packet switched traffic is not considered a teleservice in GSM.