ISL aggregation is BEST described by which of the following statements?

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

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

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

D.
Allows vendors to create more E-_Port in a switch and limit their use for ISLs