Given an assembly$-$line balancing problem, which of the following is not true?

a$)$ The smaller the number of workstations assigned, the better solution is

b$)$ The higher the efficiency of the line balance, the better the solution is

$($c$)$ The lower the efficiency of the line balance, the better the solution is

d$)$ The maximum time a product is allowed at each workstation equals to the cycle time

e$)$ Both a and $b$ are true

What is the correct answer