( X1'a + X1b)X3' + X3X2 is this wrong way to approach this problem ?

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The following circuit implements a two-input AND gate using two $2-1$ multiplexers.

What are the values of $X_1, X_2, X_3$?

- $X_1 = b, X_2 = 0, X_3 = a$
- $X_1 = b, X_2 = 1, X_3 = b$
- $X_1 = a, X_2 = b, X_3 = 1$
- $X_1 = a, X_2 = 0, X_3 = b$

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