The is a security technique associated with the use of credit cards at the time of purchase that checks additional digits printed on the back of the credit cards.

Card Verification Number

Explanation:

The card verification number is the additional code printed on the back of the debit or credit card. On most cards it is the last three digits printed on the signature strip located on the back of the card. On American Express (AMEX) cards, this is usually a four-digit code on the front of the card. Since this number is not embossed (like the card number), it is not printed on receipts, so it is unlikely that anyone, In addition to the actual cardholder, know him.

answer; tech (a) is correct;

answer(c) factors of production;