19. Suppose f :X Y is a function. Which of the following are possible? Explain. a. fis injective but not surjective. b. fis surjective but not injective. С. |X| = |Y| and f is injective but not surjective. d. X| = |Y| and f is surjective but not injective. e. X| = |Y|, X and Y are finite, and f is injective but not surjective. f. X = |Y|, X and Y are finite, and f is surjecive but not injective.

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A: Other expert has solved part b. Here We include part a answer.

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