What is the primary cause of hard drive failures?

?A(n) ____ is an electronic device with software that enables the user to make a purchase online.

A. ?digital wallet B. ?electronic wallet C. ?e-wallet D. ?all of the above

Many-to-many relationships are created using a third table that forms ____ relationships with the two original primary tables.

A. many-to-one B. one-to-many C. many-to-many D. one-to-one