According to best practice, which of the following is required when implementing third party software...

 According to best practice, one of the requirements when implementing third party software in a production environment is to scan the application for vulnerabilities. Vulnerabilities are weaknesses or flaws in the software that can be exploited by attackers to compromise the security, functionality, or performance of the system or network. Scanning the application for vulnerabilities can help to identify and mitigate the potential risks, ensure the compliance with the security policies and standards, and prevent the introduction of malicious code or backdoors. Contracting the vendor for patching, negotiating end user application training, and escrowing a copy of the software are all possible requirements when implementing third party software in a production environment, but they are not the most essential or best practice requirement of doing so. References: CISSP All-in-One Exam Guide, Eighth Edition, Chapter 8, Software Development Security, page 1018. Official (ISC)2 CISSP CBK Reference, Fifth Edition, Chapter 8, Software Development Security, page 1040.