Which of the following is a control activity in relation to occurence? O a. At the end of each month, the accountant reviews whether income has been received for all current rental agreements. O b. The accountant inspects areas where repair costs have been invoiced to ensure repairs have been carried out. O c. The accountant compares the amount in the building repairs invoice with the repairs quotation. 0 d. The accountant reviews rental income received around year-end to see which period it has been recorded in