已知y=f(x)y = f(x)y=f(x)是定义在区间[−3,6][−3,6][−3,6]上的单调函数,值域为[3,9][3,9][3,9],则其反函数x=φ(y)x = \varphi(y)x=φ(y)的定义域为( ).
(A)[−3,6][−3,6][−3,6]
(B)[3,9][3,9][3,9]
(C)(−3,6)(−3,6)(−3,6)
(D)[3,9)[3,9)[3,9)
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