In the context of the following JWT token, which of the following statement is true?

A JWT consists of three parts:Header,Payload, andSignature, separated by dots (.). The given JWT is:

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJUYW1I1joiU2vjbB3ZiNo_mn0vNWT4G1-ATqOTmo7rm70VI12WCdkMI_S1_bPg_G8

The first part (eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9) is the Header.

The second part (eyJUYW1I1joiU2vjbB3ZiNo_mn0vNWT4G1-ATqOTmo7rm70VI12WCdkMI_S1_bPg_G8) is the Payload.

The third part (not fully shown) would be the Signature, which is computed as HMAC-SHA256(base64UrlEncode(header) + "." + base64UrlEncode(payload), secret).

Option A ("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9 represents a JWT Signature"): Incorrect, as this is the Header, not the Signature.

Option B ("mn0vNWT4G1-ATqOTmo7rm70VI12WCdkMI_S1_bPg_G8 represents a JWT Signature"): Incorrect, as this is part of the Payload, not the Signature.

Option C ("eyJUYW1I1joiU2vjbB3ZiNo represents a JWT Signature"): Incorrect, as this is the beginning of the Payload, not the Signature.

Option D ("None of the above"): Correct, as none of the segments listed represent the JWT Signature (the third part, which is not fully shown).

The correct answer is D, aligning with the CAP syllabus under "JWT Structure" and "Token Security."References: SecOps Group CAP Documents - "JSON Web Tokens (JWT)," "Token Integrity," and "OWASP JWT Cheat Sheet" sections.