Integrating security activities within the development process is the best option to lower the cost to implement application security controls because it ensures that security is considered and addressed throughout the software development life cycle (SDLC), from design to deployment, and reduces the likelihood and impact of security flaws or vulnerabilities that may require costly fixes or patches later on. Performing security tests in the development environment is not the best option because it may not detect or prevent all security issues that may arise in different environments or scenarios. Performing a risk analysis after project completion is not a good option because it may be too late to identify or mitigate security risks that may have been introduced during the project. Including standard application security requirements is not a good option because it may not account for specific or unique security needs or challenges of different applications or projects. Reference: https://www.isaca.org/resources/isaca-journal/issues/2017/volume-2/secure-software-development-lifecycle https://www.isaca.org/resources/isaca-journal/issues/2016/volume-4/technical-security-standards-for-information-systems

Established risk domains are important for effective risk decision making because they provide a basis for categorizing risks and assessing their impact on the organization. Risk domains are also used to assign risk ownership and prioritize risk management activities. Having established risk domains in place helps ensure that risks are properly identified and addressed, and enables organizations to make informed and effective decisions about risk. Risk reporting procedures, an audit committee consisting of mid-level management, and well-defined and approved controls are all important components of an effective risk management program, but established risk domains are the most important for effective risk decision making.

Key performance indicators (KPIs) are metrics that measure the effectiveness and ef-ficiency of information security processes and activities. They help senior manage-ment understand the status of information security compliance by providing relevant, timely and accurate information on the performance of security controls, the level of risk exposure, the return on security investment and the progress toward security ob-jectives. KPIs can also be used to benchmark the organization's security performance against industry standards or best practices. KPIs should be aligned with the organiza-tion's strategic goals and risk appetite, and should be reported regularly to senior man-agement and other stakeholders.
Reference:
* 1 Key Performance Indicators for Security Governance, Part 1 - ISACA
* 2 Key Performance Indicators for Security Governance, Part 2 - ISACA
* 3 Compliance Metrics and KPIs For Measuring Compliance Effectiveness - Reciprocity
* 4 14 Cybersecurity Metrics + KPIs You Must Track in 2023 - UpGuard