Question

Look at the statement below.

If a number is divisible by 8, it is divisible by 4.

Which of these is a logically equivalent statement?
Choices

All numbers divisible by 4 are also divisible by 8.
If a number is not divisible by 4, it is not divisible by 8.
If a number is not divisible by 8, it is not divisible by 4.
A number is divisible by 4 if and only if it is divisible by 8.