Which statement is true about this argument? argument : if a number is divisible by 2, then it is even. the number of 4 is divisible by 2. therefore, the number 4 is even. 1. the argument is not valid 2. the argument us valid by the law of detachment. 3. the argument is valid by the law of syllogism. 4. the argument is valid but doesn't follow the law of detachment nor syllogism.