The subnet mask on the serial interface of a router is expressed in binary as 11111000 for the last octet. How do you express the binary number 11111000 in decimal?（）

A. 158
B. 0x9D
C. 156
D. 157
E. 0x19
F. 0x9F

A. 172.16.45.0
B. 172.16.45.4
C. 172.16.45.8
D. 172.16.45.12
E. 172.16.45.18

A. Device identifiers
B. Capabilities list
C. Platform
D. Route identifier
E. Neighbor traffic data