If A is an integer, which of the following CANNOT be inferred from the statement above?
If A is a multiple of 5, then a is a multiple of 10.
If A is not a multiple of 5, then a is not a multiple of 10.
A necessary condition for A to be a multiple of 10 is that A is a multiple of 5.
A is multiple of 10 implies that a is a multiple of 5.