Question: 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’s public key. In notation of X.509, this chain is represented in the correct order as –

Options

A : X2 X1 X1 B

B : X1 X1 X2 A

C : X1 X2 X2 B

D : X1 X2 X2 A

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