What is the inverse of the following conditional statement? "If a number is divisible by ten, then the last digit is zero." If the last digit in a number is not zero, then the number is not divisible by ten. If a number is divisible by ten, then the last digit is zero. If the last digit in a number is zero, then the number is divisible by ten. If a number is not divisible by ten then the last digit in the number is not zero.