If a security mechanism offers availability, then it offers a high level of assurance that authorized subjects can the data, objects, and resources.

a. control
b. audit
c. access
d. repudiate

C. Access

Explanation:

Based on the information provided within the question it can be said that the term being mentioned is Access. This is because accessibility of these three things is the main goal of availability. Which is what the security mechanism is offering, therefore the authorized subjects must have complete access to the data, objects, and resources.

d. use a mixture of external and internal links

explanation:

go to edit profile and on the ; eft hand side it has a bunch of options and the very last on says profile picture, click the blue edit sign next to it