When payment is received in respect of services rendered or goods sold in the past periods, the accounting rule is to debit cash or bank as the case may be and credit account receivable for the amount received. This is necessary because in period when transaction took place, revenue has been credited and account receivable debited.
Serving the bottom of the pyramid means carrying in goods that are inexpensive by that class of the budget where individuals cannot afford luxuries like several advanced countries. They cannot afford high charges and would exploration for something affordable. Among the given examples Radical computer corp. which definite to build reasonable computers and install wireless arrangement to assist the humblest in getting these amenities which they generally cannot afford serves as an example of attending the bottom of the pyramid. Hence the answer is B
