Which wildcard mask is associated with a subnet mask of /27?

Which wildcard mask is associated with a subnet mask of /27?

A.
0.0.0.31

B.
0.0.0.27

C.
0.0.0.224

D.
0.0.0.255

Explanation:
BD
Slash Netmask Wildcard Mask
/27 255.255.255.224 0.0.0.31
Further reading
Source: https://en.wikipedia.org/wiki/Wildcard_mask