A. WhatsApp
B. Facebook
C. Tik Tok
D. Viber

Solution

A. WhatsApp

Explanation

WhatsApp launched an India-focused fact-checking feature to combat fake news and rumours starting with the run-up to the Lok Sabha elections. Developed in collaboration with India-based media skilling startup PROTO, the tip line feature will help create a database of rumours to study misinformation during elections as part of a research project commissioned and assisted by WhatsApp.