Explanation: Countermeasure is the activity that is used for the reduction or avoidance of the threats or malfunction that occur in the operating system.The tool consists of the major components like firewalls , antiviruses etc to secure the system. It protects the servers, data systems , networks etc.
Other options are incorrect because vulnerability is the capability of a system being in exposed situation, adversary is a conflict situation and risk is the event that can cause loss in the operating system.Thus , the correct option is option(A) for checking the authorization of the individual and then only letting him access the network.
When you established social links, your social media site profile may eliminate almost any generic symbol throughout the list of contacts and the Individuals Pane with profile pic the contact may have placed. Thus, the Users Pane would be exchanged with profile image of the contact while establishing the social connections.
