Which of the following are true of loops?

Question $4$ options:

For loops repeat statements a specific number of times

General form is: for variable $=$ expr, statement, $...,$ statement, END

For loops are best suited when the number of times through the loop is fixed before starting the loop

Long loops are more efficient when the matrix to be filled with calculated data is created prior to the loop $($example y $=$ NaN$*$ones$($N$,1))$ and the loop replaces the NaN with values as it calculates them

All of the above are true of for loops