In a code language 'MATHEMATICS' is written as 'LBSIDNZUHDR'. How is 'CHEMISTRY' written in that code language ?

• The code shifts each letter of the word backward by 1 position in the alphabet (e.g., M becomes L, A becomes Z, T becomes S).", "- Applying this rule to 'CHEMISTRY': C becomes B, H becomes G, E becomes D, M becomes L, I becomes H, S becomes R, T becomes S, R becomes Q, Y becomes X.", "- Wait, let's re-verify the pattern from 'MATHEMATICS' to 'LBSIDNZUHDR'. M->L (-1), A->B (+1), T->S (-1), H->I (+1), E->D (-1), M->N (+1), A->Z (-1), T->U (+1), I->H (-1), C->D (+1), S->R (-1).", "- The pattern is an alternating shift: -1, +1, -1, +1, -1, +1, -1, +1, -1, +1, -1.", "- Applying this alternating pattern to 'CHEMISTRY' (9 letters): C(-1)=B, H(+1)=I, E(-1)=D, M(+1)=N, I(-1)=H, S(+1)=T, T(-1)=S, R(+1)=S, Y(-1)=X.", "- The resulting code is BIDNHTSSX, which matches option (b).", "- Therefore, the correct code for 'CHEMISTRY' is BIDNHTSSX.