What is the optimal assignment of resources to jobs?
a. 1 to a; 2 to c; 3 to b; 4 to d
b. 1 to b; 2 to d; 3 to c; 4 to a
c. 1 to c; 2 to b; 3 to a; 4 to d
d. 1 to d; 2 to b; 3 to c; 4 to a
e. 1 to a; 2 to c; 3 to d; 4 to b?