A. In IPv4 addressing, a block of address can be define as x. y. z. t/n in which x. y. z. t define one of the address and /n define the mask
B. The first address in the block can be found by setting the rightmost 32-n bits to 0s
C. Address of class C is used for multicast communication
D. There are five classes in IPv4 address
E. Supernetting combine several networks into one large network 
Choose the correct answer from the options given below:

Correct option is B

The correct answer is (b) A, B, D, and E only. This set of statements correctly describes IPv4 addressing and subnetting. IPv4 addresses are structured, with specific blocks used for various purposes, and supernetting combines networks for efficiency.
Information Booster
· IPv4 Addressing:
· A block of IPv4 addresses is represented by x.y.z.t/n, where x.y.z.t represents an address and /n represents the number of fixed bits in the subnet mask.
· The first address in a block can be derived by setting the rightmost 32-n bits to 0.
· Supernetting:
· Supernetting is a technique that merges multiple networks into one larger network, often used to improve routing efficiency.
Additional Knowledge
· Statement C (Incorrect): Class C addresses are not used for multicast; Class D addresses are designated for multicast communication.