The z statistic for a test of H0 : p = 0.4 versus Ha : p ≠ 0.4 is z = 2.43. This test is

(a) not significant at either a = 0.05 or a = 0.01.

(b) significant at a = 0.05 but not at a = 0.01.

(c) significant at a = 0.01 but not at a = 0.05.

(d) significant at both a = 0.05 and a = 0.01.

(e) inconclusive because we don’t know the value of p^ .