Parul has been given a table which contains a list of e-mail addresses. She has been asked to find all the valid e-mail addresses in the list and put a tick mark in front of them. Help her in finishing the given assignment.

aditi_gupta@rediffmail.com
tanmay(45)@webmail.ac.in
www.jay-singh.com
rini@86india@yahoo.com
harsh.kumar@yahoo.co.in

Diya is a very social person and wants to connect with all her friends on the Internet. She wants to join an online community where she can have her own profile, invite her friends to join, share photos, videos, etc.

1. Which Internet service is Diya interested in?
2. Suggest an example of such a service so that she could join it.
3. Also discuss its merits and demerits.

Arushi wants to organise an expert lecture for her students on the topic 'Web Services'. However, due to bad weather conditions, the guest lecturer could not come down to her institute. Suggest the technology that can be used at the last moment to organise a virtual lecture for the children.

Identify domain name(s) and URL(s) from the following list:

1. yoga@yoga.com
2. doYogaEveryday.com
3. www.doYogaEveryday.com/old/index.html
4. www.PerformingArts_schools.org/backlink.htm
5. 192.168.0.1
6. http://cbse.nic.in