.Which of the following are​ true? If​ false, explain briefly.​a) Using an alpha level of​ 0.05, a​ P-value of 0.02 results in rejecting the null hypothesis. ​b) The alpha level depends on the sample size. ​c) With an alpha level of​ 0.01, a​ P-value of 0.08 results in rejecting the null hypothesis. ​d) Using an alpha level of​ 0.05, a​ P-value of 0.07 means the null hypothesis is true