a, b, c and d are negative integers. If a^b + a^c + a^d = 0 then a X b X c X d is always

Explanation:-

Given that a^b + a^c + a^d = 0
Hence, out of these three terms some are positive and some are positive and some are negative. Since all of a, b, c and d are negative integers, only that term which hass an even power can be positive. Hence, the absolute value of at least one of a, b, c or d is even. Hence, a X b X c X d is also even