Me if i fail this i wont get my surprise.

the function p(d)=5·4^(d−1) represents the number of people who receive a certain e-mail on day d of an e-mail experiment. what does the value 5 represent in this situation?

every day, the number of people receiving the e-mail increases by 5.

every day, the number of people receiving the e-mail increases by 5%.

there are 5 people running the experiment.

five people received the e-mail on the first day of the experiment.