The X. 500 standard defines a protocol for a client application to access an X. 500 directory known as which of the following options?

A. DIB

B. DAP

C. DIT

D. LDAP

Option B is the correct answer for the above question.

Explanation:

DAP is a protocol technology that is used for the client and discovered by X. 500 in 1988. Its use for the client host on the network. The operation of this protocol is - - - Read, Bind, Search, List, Compare, Add and Modify the data.

The above question asked about the protocol which is searched by X. 500 and used for the clients. So the answer is DAP which is stated by Option B hence this option is correct while other is not because--

Option 'A' states about DIB which is not a protocol. It is used by X. 500. Option C states about DIT which is not used by X. 500. Option D states about LDAP which can be used for client or server.