Which of the following statements is true about Arduino code?

Group of answer choices

The loop$()$ function must contain either a while loop or a for loop.

It is OK to leave out the setup$()$ function as long as a loop$()$ function is in the code.

The setup$()$ function is executed after each iteration of loop$().$

The setup$()$ function is executed once and the loop$()$ function is executed iteratively, as long as the Arduino is powered on$.$