单选题Which two statements are true of a network mask?（）A A subnet mask specifies the portion of an IP address that is in a binary formatB A subnet mask specifies the portion of an IP address that is in a decimal formatC A subnet mask specifies the portion o
题目
单选题
Which two statements are true of a network mask?（）
A
A subnet mask specifies the portion of an IP address that is in a binary format
B
A subnet mask specifies the portion of an IP address that is in a decimal format
C
A subnet mask specifies the portion of an IP address that represents a network prefix
D
A subnet mask specifies the portion of an IP address that represetns network hosts