What is the difference between boost rules and promoting items? (2)

What is the difference between boost rules and promoting items? (2)
A . Boost rules are defined globally while promoted items are category aware.
B . Promoting an item prioritizes it more than the boost rules do.
C . Boost rules are attribute-focused while promoted items are product-focused.
D . Boosting an item prioritizes it more than promoting an item does.

Answer: B,C