Which of the following scenarios might use a recommendation engine?

What is the algorithm for building a binary tree program

Which tab should you open to find the option for adding a header?

2pointswho was mikhail gorbachev? oa. a russian leader who opposed a coupob. a polish leader who founded the labor union "solidarityoc. a soviet leader who called for a closer relationship with the unitedstates, economic reform, and a more open societyd. a soviet leader who called for more oppression in the soviet union