The official website name of Reliance Communication is www.rcom.co.in.

Explanation:
Reliance Communication, also known as RCom, is an Indian telecommunications company. The company provides a range of services including mobile, broadband, and enterprise solutions. Its official website is an important platform for customers to access information, services, and support.

The official website name of Reliance Communication is www.rcom.co.in. Let's explore why this is the correct answer.

1. Importance of the official website:
The official website serves as a central hub for customers and stakeholders to access information about the company. It provides details about the company's products, services, plans, offers, and contact information. Customers can also make inquiries, request support, and access their accounts through the website.

2. Website naming conventions:
Websites typically follow a specific naming convention to represent the company's brand and identity. In this case, Reliance Communication has chosen the domain name rcom.co.in, which aligns with their brand name and the country-specific domain for India.

3. Understanding the URL:
The website's URL is www.rcom.co.in. Let's break it down:

- "www" stands for World Wide Web and is a common prefix for websites.
- "rcom" represents the abbreviation of Reliance Communication, the company's official name.
- ".co" is a domain extension that is commonly used for commercial websites.
- ".in" is the country-specific top-level domain for India. It indicates that the website is primarily targeted towards an Indian audience.

4. Alternative options:
a) www.rcom.com: This option is not the correct answer as it uses the ".com" domain extension instead of ".co.in". While ".com" is a widely used domain extension, Reliance Communication has specifically chosen the country-specific domain ".co.in" for their website.
c) www.reliancecom.com: This option is not the correct answer as it uses "reliancecom" instead of "rcom" as the abbreviation for Reliance Communication. The company's official abbreviation is "RCom," and their website reflects this with the "rcom" domain name.
d) www.reliancecommunication.co.in: This option is not the correct answer as it uses "reliancecommunication" instead of "rcom" as the abbreviation for Reliance Communication. Similar to the previous option, the company's official abbreviation is "RCom," and their website reflects this with the "rcom" domain name.

In conclusion, the official website name of Reliance Communication is www.rcom.co.in. This domain name aligns with the company's brand name and the country-specific domain for India.