Which function(s) does STP serve in a Layer 2 network?

Which function(s) does STP serve in a Layer 2 network?

A.
It detects and stops broadcast storms.

B.
It distributes VLAN information between switches when a VLAN spans more than one switch.

C.
It detects and eliminates loops.

D.
It manages aggregated Ethernet bundles that span more than one switch.