What is the major security issue with standard NIS (Network Information System)?

What is the major security issue with standard NIS (Network Information System)?

A.
It is impossible to enforce a centralized login scheme

B.
NIS provides no authentication requirement in its native state

C.
There is no way to encrypt data being transferred

D.
NIS is a legacy service and, as such, is only used in order, less secure operating 1D0-470
systems and networks

Explanation:
The NIS service is inherently insecure. If you use NIS it is a constant target for unauthorized access to network.NIS is a method of distributing information throughout networks and was developed in the 1980s by Sun Microsystems.
Incorrect Answers:
A: NIS was designed to allow centralised administration of many machines.
C: Encryption can very well be used in NIS.
D: NIS, Network Information Service, is a service designed to propagate information across the network. It is not a legacy service. It is a hot academic and research subject.