Question

are discussion boards where individuals can ask questions and reply to each other.
a forums
b web portals
c news aggregators
d search engines

Explanation:

Forums are online discussion platforms where users can post questions and engage in conversations by replying to each other. Web portals are gateways to various online resources. News aggregators collect and display news from multiple sources. Search engines help users find information on the web.

Answer:

A. Forums