Random mutations are an integral component of evolution. A male lion carries a mutation in 50% of his sperm that would need lead to an advantageous trait in his offspring. If the male lion successfully mates with a female lion who gives birth to 3 male cubs and 1 female cub, what is the probability that all the male cubs inherit the advantageous trait?

a. 50%
b. 75%
c. 12.5%
d. 6.25%