For a regular expression e, let L(e) be the language generated by e. If e is an expression that has no Kleene star ∗ occurring in it, which of the following is true about e in general?
(A) L(e) is empty.
(B) L(e) is finite.
(C) Complement of L(e) is empty.
(D) Both L(e) and its complement are infinite.