$15$ Which is true of high$-$intensity interval training $($HIIT$)?$

Multiple Choice

It involves $4$ to $8$ repetitions of an exercise, with breaks of $3$ to $5$ minutes between repetitions.

It involves $2$ to $4$ repetitions of an exercise, with breaks of $1$ to $3$ minutes between repetitions.

It involves $4$ to $10$ repetitions of an exercise, with breaks of $1$ to $3$ minutes between repetitions.

It involves $2$ to $4$ repetitions of an exercise, with breaks of $3$ to $5$ minutes between repetitions.