Who is responsible for ensuring the security of business systems and developing strategies and safeguards against attacks by hackers and viruses?

Chief Information Security Officer (CISO)

Explanation:

One of the senior executive officers in an organization is the Chief Information Security Officer (CISO). Sometimes referred to as the Chief Security Officer (CSO), the responsibility of the CISO is to ensure the security of an organization's business systems and develop strategies to safeguards these systems against malicious intruders such as hacker and viruses.

This role is a very crucial one in any organization especially those that run on IT infrastructures. Not only do they ensure security, they also work together with certain staff such as security directors and managers in the organization, in order to come up with decisions that will add value to the organization and give it some competitive edge over other organizations.