Decode the uppercase string using a Caesar shift of −6; output in lowercase. Given: PSAFLT

Introduction / Context:
A uniform −6 Caesar decode transforms each letter backward by 6 places.

Given Data / Assumptions:

• Cipher: Caesar −6.
• Input: PSAFLT.

Concept / Approach:
Apply −6 to each character using modular arithmetic over 26 letters.

Step-by-Step Solution:

Verification / Alternative check:
Encode “imjvcf” with +6 to retrieve “psaflt”.

Why Other Options Are Wrong:

• algpkj, ymswtx, vbfnic: These decode to different uppercase patterns.

Common Pitfalls:
Forgetting that A shifted backward wraps to U when using −6.

Final Answer:
imjvcf