Rachel manufactures surgical gloves. Upon receiving an order from a hospital for supplying them with their requirements for three years ending on 31 December 2012, she raised an invoice for £15,000 and has accounted for it by crediting the Sales account and debiting the Receivables account. For preparing the financial statements in respect of the year ended 31 December 2010 the adjusting entries required are:

(a) Debit Sales account and credit Cash account with £10,000

(b) Debit Sales account and credit Deferred income account with £10,000

(c) Debit Sales Account and credit Receivables account with £10,000

(d) Debit Receivables account and credit Deferred income account with £10,000