i.i.d Assume X₁,..., X. N(0,0²). To test Ho : a = 2 v.s. Xn H₁:0=1, by the Neyman-Pearson lemma, which of the following is the most powerful critical region of size a? (A) {Σ, X; > ca} (D) {Σ=1X; < ca} (C) {Σ=1X? > ca} (D) {Σ=1x? < c@} [Ca is some constant depends on a, such that the test is of size a.]

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