Define \( * \) on \( Q-\{-1\} \) by \( a * \mathrm{~b}=a+b+a b \). ...

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Define \( * \) on \( Q-\{-1\} \) by \( a * \mathrm{~b}=a+b+a b \). Then, \( { }^{*} \) on \( Q-\{-1\} \) is
\( \mathrm{P} \)
(a) commutative but not associative
W
(b) associative but not commutative
(c) neither commutative nor associative
(d) both commutative and associative
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