how many hosts can be addressed in this subnet?

Given an address of 10.1.1.1 with a subnet mask of 255.255.255.224, how many hosts can be addressed in this subnet?

A.
16

B.
15

C.
30

D.
31

E.
63

Explanation:
Subnetting with a subnet mask of 224 (which is 5 bits) allows for 30 hosts in each subnet.