Suppose that A has obtained a certificate from certification authority X1 and B has obtained certificate authority from CA X2. A can use a chain of certificates to obtain B‚Äö√Ñ√∂‚àö√ë‚àö¬•s public key. In notation of X.509, the correct order of this chain is represented as ‚Äö√Ñ√∂‚àö√ë‚àö¬®$

Suppose that A has obtained a certificate from certification authority

1.	Suppose that A has obtained a certificate from certification authority X1 and B has obtained certificate authority from CA X2. A can use a chain of certificates to obtain B‚Äö√Ñ√∂‚àö√ë‚àö¬•s public key. In notation of X.509, the correct order of this chain is represented as ‚Äö√Ñ√∂‚àö√ë‚àö¬®$
A.	X2 X1 X1 B
B.	X1 X1 X2 A
C.	X1 X2 X2 B
D.	X1 X2 X2 A
Answer» D. X1 X2 X2 A

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