Final answer:
A Quantitative risk assessment is best suited for the organization's requirements to numerically estimate the probability and impact of risks associated with new network infrastructure.
Step-by-step explanation:
The most suitable type of risk assessment for evaluating potential risks in new network infrastructure, including vulnerabilities, downtime, and financial impact, is B. Quantitative risk assessment.
A quantitative risk assessment involves numerically estimating the probability of adverse events and their impact on the organization. This type of assessment uses data, such as historical cyberattack frequency, average downtime costs, and financial impact estimates, to provide concrete figures that an organization can use for making informed decisions. It is effective in scenarios where managing cybersecurity risks involves understanding the potential financial loss and operational impact in measurable terms.
In contrast, a qualitative risk assessment relies on subjective judgments rather than numerical data, an ad hoc risk assessment is performed as needed and lacks a systematic approach, and a continuous risk assessment is an ongoing process rather than a one-time evaluation. A quantitative risk assessment is specific and thorough for the needs mentioned, such as estimating potential downtime and assessing financial impacts due to cyberattacks.