Which of the following statement are true? The product of a positive and negative integer is negative. The product of three negative integers is a negative integer. Of the two integers, if one is negative, then their product must be positive. For all non-zero integers `a\ a n d\ b ,\ axxb` is always greater than either `a\ or\ bdot` The product of a negative and a positive integer may be zero. There does not exist an integer `b\ ` such that for `a >1,\ axxb=bxxa=bdot`