Cost-benefit analysis results are the best way to support the business case for an increase in the information security budget because they help to demonstrate the value and return on investment of the proposed security initiatives or projects. A cost-benefit analysis is a method of comparing the costs and benefits of different alternatives or options, taking into account both quantitative and qualitative factors. A cost-benefit analysis helps to justify the need and feasibility of the security budget, as well as to prioritize the security spending based on the expected outcomes and impacts. Therefore, cost-benefit analysis results are the correct answer.
References:
* https://www.cisa.gov/resources-tools/resources/business-case-security
* https://www.cisa.gov/resources-tools/resources/isc-best-practices-making-business-case-security
* https://risk3sixty.com/2020/09/21/how-to-build-a-business-case-for-security-initiatives-part-4/