For -π/2 ≤ θ ≤ π/2, |sinθ| ≥ 1 is true for all and only the values of θ in which of the following sets?
A. {-π/2, π/2}
B. {π/2}
C. {θ | -π/2 < θ < p/2}
D. {θ | -π/2 ≤ θ ≤ π/2}
E. The empty set
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