What is the simplified version of the four-variable K-map for the following expression

* AB C D + ACD + B CD + A BCD + BC D

Select one:

a. F = B'D +A'BD + ABC'

b. F = B'D' +A'BD + ABC'

c. F = B'D' +A'BD + AB'C

d. F = B'D' +A'BD + ABC