You are given the following address: 15.16.193.6/21.
Determine the subnet mask, address class, subnet address,
and broadcast address.
A. 255.255.248.0, A, 15.16.192.0, 15.16.199.255
B. 255.255.248.0, B, 15.16.192.0, 15.16.199.255
C. 255.255.248.0, A, 15.16.199.255, 14.15.192.0
D. 255.255.242.0, A, 15.16.192.0, 15.16.199.255
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