Which one is False for a recursive function?

Select one:

a$.$ Recursive algonthems are always more efficient than iterative ones

b$.$ Recursive function is a function that calls itself

c$.$ In base case, the problem can be solved without recursion

d$.$ Recusive function must have a way to control the number of omes it repeats

e$.$ In recursive case, the problem can be reduced to smaller problem of same structure.