D View Feedback Question 7 Which of the following is a potential approach to calculating the margin of error for a confidence interval? (a) In Excel, use the =NORM.S.INV function to identify a z-score and multiply it by the standard error calculation. b) In Excel, use the = CONFIDENCE. NORM function. ()c) In Excel, use the Data Analysis tool's Descriptives function, and specify a desired confidence level. (d) All of the above. (e) None of the above