Which of the following statements regarding multicast MAC address is correct?

Which of the following statements regarding multicast MAC address is correct?
A . The first six hexadecimal value of the multicast Mac address is 0x01005e.
B . Multicast MAC address is composed of 23 bits.
C . The range of multicast MAC address is assigned by IEE
E . On Ethernet, 28-bits of layer 3 multicast IP address are mapped into the 24-bits of the layer 2 multicast MAC address.

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Answer: B