Applying a combined reverse alphabet and shift, where (A=Z, B=Y...) and each reversed letter is shifted back by 1. For DIAMOND: Reversed: W RZNLMW, Code: VQYMKLV. The pattern is shown: W-1=V, R-1=Q, Z-1=Y, N-1=M, L-1=K, M-1=L, W-1=V. Applying this to FEMALE: F reverses to U, then U-1 = T; E reverses to V, then V-1 = U; M reverses to N, then N-1 = M; A reverses to Z, then Z-1 = Y; L reverses to O, then O-1 = N; E reverses to V, then V-1 = U. The result is TUMYNU, which corresponds to option (1).