The expression 900⋅2.25^t gives the price performance, in bits per second per dollar, of wireless devices from a certain company as a function of years since the company began. what does 900 represent in this expression?

choice a: the company's initial price efficiency was 900 bits per second per dollar.

choice b: the company will have its maximum price efficiency 900 years after it began.

choice c: the price efficiency is multiplied by 900 each year.