Which of the following matter is relevant for preparing Cash Budget? (a) While determining the cash payments, it is necessary to estimate the credit sales. (b) While estimating cash receipts, it is not necessary to estimate the figure of credit sales. (c) To estimate the timings when cash collections would be obtained from. credit sales, (d) While estimating the total amount of cash payment for purchases, it is necessary to decide from which suppliers materials are to be purchased