The function p(d)=5⋅4d−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?




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


There are 5 people running the experiment.


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.