What important concept did the Altair use, which was borrowed by its competition, including the IBM personal computer? a. The computer came in kit form. b. The computer’s price was $666. c. The...

What important concept did the Altair use, which was borrowed by its competition, including the IBM personal computer?

a. The computer came in kit form.

b. The computer’s price was $666.

c. The machine had an open architecture.

d. The machine could be used without plugging it into a wall outlet.