You need to decrypt customer data to provide it to an application.

Comprehensive and Detailed In-Depth Explanation:

The Vault Transit secrets engine returns decrypted data inbase64-encoded format:

B. The output is base64 encoded: "All plaintext data must be base64-encoded before being encrypted by Vault. As a result, decrypted data is always base64 encoded." Users must decode it (e.g., using base64 -d) to see cleartext.

Incorrect Options:

A. Permission Issue: Permissions would cause an error, not encoded output. "Not because the user lacks permission."

C. Wrapped Token: The output is plaintext, not a token. "Not a response wrapped token."

D. Original Encryption: Irrelevant; the issue is encoding, not encryption state.

This encoding ensures safe transmission of binary data.