20. In the control role, a management accountant's value-add lies in: a. Investigating variances by exception Canterbury Institute of Management. 41 McLaren Street, NORTH SYDNEY NSW 2060 Australia Phone +61 2 8007 5846 Fuc *61 29280 1850 Website https//com ACCT201 Firul Bramination Questions Page 4 of 10 : b. Understanding and able to explain major favourable and unfavourable variances c Identifying the root cause and the necessary actions to resolve the issue and prevent recurrence d. All of the above