C
because you have to re read it
Answer:
I do believe it is D im not sure
<span>Financial transactions were one of the first purposes of computers. This is where "ticker tapes" came from; early computers were used to keep track of how stocks were performing. Computers in early days used large mainframe systems and punch cards to keep track of this type of data.</span>
<span>A _superkey___ is any key that uniquely identifies each row.</span>
The answer is choice D-All of these :)
