On serial interface, you type ipv6 address 2000:db8:4400:2300::1234/64. Which statement is true?

A. The router will calculate a network ID of 2000:0db8::.
B. The IPv6 address of 2000:0db8:4400:2300:1234:0000:0000:0000/128 will be assigned to Serial 0/0.
C. The router will calculate a network ID of 2000:0db8:4400:2300::/64 for Serial 0/0.
D. The router will calculate a network ID of 2000:db8:4400:2300:0000/64 for Serial 0/0.

C. The network ID of 2000:0db8:4400:2300::/64 will be calculated and assigned to the directly connected route of Serial 0/0.