Which of the following statements are true?

a. Every recursive method must have a base case or a stopping condition.
b. Every recursive call reduces the original problem, bringing it increasingly closer to a base case until it becomes that case.
c. Infinite recursion can occur if recursion does not reduce the problem in a manner that allows it to eventually converge into the base case.
d. Every recursive method must have a return value.
e. A recursive method is invoked differently from a non-recursive method.

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