Mr. Ali has a current account in a bank with a credit balance of RO 8,000. An overdraft limit of RO 20,000 is sanctioned by the bank on his current account for a period of one year. Now Mr. Ali can draw cheques on his current account: O a. Up to a maximum amount of RO 20,000 O b. Up to a maximum amount of RO 14,000 O c. Up to a maximum amount of RO 8,000 d. Up to a maximum amount of RO 28,000