In a data flow diagram of the vendor payment process, what symbol would most appropriately reflect an update of the payables account?

a		a circle
b		a square
c		two horizontal lines
d		none of the above

Social engineering is

a		verifying credit card validity; buying and selling stolen credit cards.
b		inserting a sleeve into an ATM so that it will not eject the victim's card, pretending to help the victim as a means of obtaining his PIN, and using the card and PIN to drain the account.
c		a technique that tricks a person into disclosing confidential information.
d		changing data before, during, or after it is entered into the system in order to delete, alter, or add key system data.