It Transmits electrical currents. You can use it as an amplifier or switch of currents.
I am guessing "A" because you can store code anywhere and file structure does not prevent viruses.
hope this helped
<span />
Answer:
Changing the customer number on a record in the Orders table to a number that does not match a customer number in the customer table would violate referential integrity.
If deletes do not cascade, deleting a customer that has orders would violate referential integrity.
If deletes cascade, customer can be deleted and all orders for that customer will automatically be deleted.
