Which two statements are true about bandwidth guarantee? (Choose two)

A.
When congestion isn’t present, the bandwidth command doesn’t allow exceeding the allocated
rate.

B.
When congestion is present, the bandwidth command allows exceeding the allocated rate

C.
When congestion is present, the bandwidth command doesn’t allow exceeding the allocated
rate

D.
When congestion isn’t present, the bandwidth command allows exceeding the allocated rate

Explanation:
http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a0080103eae.shtml