For a certain model vehicle, failure for the engine to start is due to (i) an electrical problem 48% of the time, (ii) a mechanical problem 30% of the time, and (iii) both electrical and mechanical problems 7% of the time.

If the engine of this model vehicle fails to start, what is the probability that it is due to an electrical problem, a mechanical problem, or both?

Answer options:

a. 0.85

b. 0.71

c. 0.78

d. 0.76