Automated and Pre-Programmed Social Media Posts and Replies to User

Automated and pre-programmed social media posts and replies to user generated comments (such as Tweets or Facebook posts) can be useful for workflow automation,but often can be viewed by users as fake or disingenuous.What is this practice referred to as?

A) Social media trolls.
B) Social media robots.
C) Social media zombies.
D) Social media auto-dialers.
E) None of these.