Correct Answer: CWhen informed of a new vulnerability in an online banking application, the first step the information security manager should take is to perform a risk assessment. This allows them to understand the potential impact and likelihood of the vulnerability being exploited within the 72-hour window before the patch is available. Conducting a risk assessment provides crucial information on the criticality of the system, the sensitivity of the data, the existing security controls, and the potential consequences. This enables informed decision-making regarding the necessity and extent of any mitigating controls, the need to notify senior management, and other actions to manage and mitigate the risk effectively.