General IT-controls are important because: (i) They prevent unauthorized personnel from having access to data and applications. (ii) They impact the effectiveness of other application controls. (iii) They affect the reliability of electronic audit evidence. (iv) They allow reporting entity's staff to change computer programs without needing to receive authorization for the change. Select one: a. (i), (ii) and (iii). b. (i), (iii) and (iv). c. (i), (ii) and (iv). d. (ii), (iii), (iv)