Choose the statement which BEST describes ISL aggregation?

A.
Prevents unauthorized use of ISLs by combining them into a single security domain.

B.
Mechanism by which one or more ISLs can be reserved for special situations when extra bandwidth is needed

C.
Allows vendors to create more E_Ports in a switch and limit their use for ISLs

D.
Enables distribution of traffic over the combined bandwidth of two or more ISLs and increases availability