Final Answer:
The BEST explanation for a risk associated with continuing to use legacy software to support a critical service is:
3) Lack of vendor support
Step-by-step explanation:
Using legacy software to support a critical service poses the significant risk of a lack of vendor support. Over time, vendors phase out support for older software versions as they release newer updates and versions. Without ongoing support from the vendor, the company using legacy software may face challenges such as security vulnerabilities, unpatched bugs, and an inability to address evolving technology and compliance requirements. This lack of support can lead to increased exposure to potential security threats and compromises, hindering the organization's ability to maintain a secure and reliable critical service.
The absence of vendor support means that the company will not receive updates, patches, or assistance in addressing issues that may arise with the legacy software. This could result in an increased susceptibility to cybersecurity threats, as security vulnerabilities in the software may go unaddressed. Additionally, the lack of support may limit the company's ability to integrate the legacy software with new technologies or adapt to changes in the operating environment. In the long run, relying on unsupported software can jeopardize the stability, security, and performance of the critical service, potentially leading to disruptions and compromising the organization's overall functionality and reputation