Need help with networking problems for homework.

1. Select the correct subnet mask for the following CIDR notation: 10.10.122.18/10.

A. 255.255.192.0

B. 255.192.0.0

C. 255.255.0.0

D. 255.0.0.0

2. CIDR allows flexibility in which subnet mask to use, while VLSM is rigid and forces the use of the same subnet mask for all subnets. True or false.

3. Select the classful subnet mask for 172.22.118.137.

A. 255.255.0.0

B. 255.255.255.0

C. 255.0.0.0

D. 172.22.255.255

4. If VLSM or CIDR are not used, then devices are not on a subnet, they are just on a network. True or False.