Let p be the population proportion of people who spent less than $1,600. You want to test the null hypothesis that p is less than of equal to 0.50 versus a one-tailed alternative. Which of the following is true?

a. The null can be rejected at the 5% level but not at the 1% level.

b. The null can be rejected at the 10% level but not at the 5% level.

c. The null can be rejected at the 1% level.

d. The null cannot be rejected at the 10% level.

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