The 20 bit prefix extends four bits into the third octet (176).
176 in binary is 10110000, so with the mask the address ends at 1011.
You want to use the next four bits for subnetting (last four 0's)
This gives the range of 10110000 (176) through 10111111 (191)
providing 16 subnets with 256 addresses in each subnet.
Typically the first and last subnet are not used, toss out 176 and 191,
this leaves 177 through 190, each with a 24 bit mask. (We started with
20 bits, and we added four bits for our own subnets).
Looking at the possible answers, the following fall in this range.
C) 172.16.183.0/24
F) 172.16.190.0/24
Ed
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