when using mapreduce, a function takes a collection and data and sorts and filters it into a set of key-value pairs.

Social networking sites d. online forumsthe first recognizable social media site,  six  degrees, was created in 1997. it enabled users to upload a profile and make friends with other users. in 1999, the first blogging sites became popular, creating a social media sensation that's still popular today.

Idon't have a single clue tbfh

Islide through the whole

Answer (a) with a mirror like surface;