Task: Question Answering
Input (English): Problem: if the operation @ is defined for all a and b by the equation a @ b = ( a ^ 2 * b ) * 3 , then 2 @ ( 3 @ - 1 ) = 
Options: a ) - 324 , b ) 223 , c ) 324 , d ) - 223 , e ) - 410
Output (English): a