Which of the below listed is not a "Google Infrastructure Security Layers"?

Answer options:

A.Operational Security
B.Internet Communication
C.User Identity
D.Application Security

Correct Answer: D
Option A is incorrect. Operation Security is a part of "Google Infrastructure Security Layers". Refer to the diagram below.
Option B is incorrect. Internet Communication is part of "Google Infrastructure Security Layers". Refer to the diagram below.
Option C is incorrect. User Identity is a part of "Google Infrastructure Security Layers". Refer to the diagram below.
Option D is correct. Application Security is not a part of "Google Infrastructure Security Layers". Refer to the diagram below.
Picture credit and reference link:
https://cloud.google.com/security/infrastructure/design