Which pair of hypothesis statements is correct for a one-sample t-test for means?

Which pair of hypothesis statements is correct for a one-sample t-test for means?

a. Ho: Male average salary less than (<) 50K. Ha: Male average salary => 50K.

b. Ho: Male average salary = 50K. Ha: Male average salary greater than (>) 50K.

c. Ho: Male average salary = 50K. Ha: Male average salary not equal (=/=) 50K.

d.Ho: Male average salary less than or equal (<=) 50K. Ha: Male average salary more than => 50K

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