If ROBUST is coded as QNATRS in a certain language, which word will be coded as ZXCMP?

AYDNQ

The correct answer is Option (2) → AYDNQ

In the given code:

ROBUST → QNATRS

Each letter is shifted one step backward in the English alphabet:

• R → Q
• O → N
• B → A
• U → T
• S → R
• T → S

So the rule is: each letter −1.

Now decode ZXCMP by shifting each letter one step forward:

• Z → A
• X → Y
• C → D
• M → N
• P → Q

This gives AYDNQ.

Correct Answer: AYDNQ 

Note: There may be some confusion regarding the direction of coding and decoding. In the given example, ROBUST is coded as QNATRS by shifting each letter one step backward (−1). However, the question asks for the word that has been coded as “ZXCMP”. This means we need to decode the given word, i.e., reverse the process by shifting each letter one step forward (+1). Hence, Z → A (with wrap-around), X → Y, C → D, M → N, and P → Q, giving AYDNQ as the correct answer.