Decode the uppercase string using a Caesar shift of −6 (backward by 6), then output in lowercase. Given: XACGLY

Introduction / Context:
We apply a uniform backward shift to decode and present the result in lowercase.

Given Data / Assumptions:

• Cipher: Caesar −6.
• Input: XACGLY.

Concept / Approach:
For each letter L, compute L−6 modulo 26. Then convert to lowercase.

Step-by-Step Solution:

Verification / Alternative check:
Encoding “ocqzkd” with +6 retrieves “xacgly”.

Why Other Options Are Wrong:

• julsqr, lzcndo, hijump: Each implies a different shift magnitude/direction.

Common Pitfalls:
Dropping wrap-around at the alphabet ends (A..Z).

Final Answer:
ocqzkd