Which two of the following options are benefits of using VLSM when subnetting a block of IP addresses?

Which two of the following options are benefits of using VLSM when subnetting a block of IP addresses? (Choose two.)
A. the ability to join Class B and Class C networks on the same broadcast domain
B. more efficient use of IP addresses.
C. Better-defined network hierarchical levels
D. There are no benefits. Using VLSM wastes IP addresses, because all subnets must contain the same quantity of usable IP addresses.

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