Let \( a_1,a_2,a_3,a_4 \) be an A.P. of four terms such that each term of the A.P. and its common difference \( l \) are integers. If \( a_1+a_2+a_3+a_4=48 \) and \( a_1 a_2 a_3 a_4 + l^4 = 361 \), then the largest term of A.P. is equal to:
\( 21 \)
\( 27 \)
\( 23 \)
\( 24 \)
