Comprehensive and Detailed In-Depth Explanation:

Vault policies define access control using specific capabilities. The Vault documentation lists the valid capabilities:

" When creating a policy, only the following capabilities are available in Vault:

create

read

update

delete

list

sudo

deny " — Vault Policies: Capabilities

A : list is valid:

" The list capability enables the user to view a list of available resources or entities within Vault. "

— Vault Policies: Capabilities

B : deny is valid:

" The deny capability is used to explicitly deny access to specific resources or operations within Vault. "

— Vault Policies: Capabilities

E : create is valid:

" The create capability allows the user to create new policies, roles, tokens, and other entities within Vault. "

— Vault Policies: Capabilities

F : write is a common shorthand for update in Vault’s context and is valid:

" The update capability (often referred to as write in CLI contexts) allows the user to modify or update existing resources or entities within Vault. "

— Vault Policies: Capabilities

Note: While write isn’t explicitly listed, it’s synonymous with update in practice, as confirmed by CLI usage and community convention.

C : apply is not a Vault policy capability.

D : root is not a capability; it’s a policy name for superuser access.