Which of the following is the correct syntax to check if a variable num is either 1, 2, or 3 using when with multiple conditions?

Which of the following is the correct syntax to check if a variable num is either 1, 2, or 3 using when with multiple conditions?

when (num) {
    ? -> println("Number is 1, 2, or 3")
    else -> println("Other number")
}