Final answer:
The best solution is to deploy an integrated software tool that builds and tests each portion of code committed by developers and provides feedback.
Step-by-step explanation:
The solution that best meets the security engineer's goal is option D, which is to deploy an integrated software tool that builds and tests each portion of code committed by developers and provides feedback.
By implementing this solution, the security engineer ensures that developers are not blocked by a large number of security requirements applied at specific schedule points. The integrated software tool allows for continuous and automated security testing, providing developers with real-time feedback on the security of their code. This way, security is built into the products being developed without causing delays or disruptions in the development process.