Which shows a correct way to determine the volume of the right rectangular prism?

A prism has a length of 4 centimeters, height of 6 centimeters, and width of 3 centimeters.
3 + 6 + 4 = 13 Centimeters cubed
2(3 + 6 + 4) = 26 Centimeters cubed
4(3) + 6 = 18 Centimeters cubed
3(6)(4) = 72 Centimeters cubed

A. find the power of the test, when the null hypothesis assumes a population mean of mu = 450, with a population standard deviation of 156, the sample size is 5 and the true mean is 638.47 with confidence intervals of 95 b. find the power of the test, when the null hypothesis assumes a population mean of mu = 644, with a population standard deviation of 174, the sample size is 3 and the true mean is 744.04 with confidence intervals of 95% c. find the power of the test, when the null hypothesis assumes a population mean of mu = 510, with a population standard deviation of 126, the sample size is 10 and the true mean is 529.44 with confidence intervals of 95