The correct answer is D . In Zero Trust architecture, risk assessment is continuous and adaptive , not static.
Zscaler documentation states that policy decisions consider far more than a one-time identity check. User access is evaluated using context such as user identity, device posture, location, group membership, and time of day , and those conditions can change between requests. ZPA guidance also states that organizations should use logs to determine which users are accessing which apps, and automatically adapt based on any changes in context .
This directly supports the idea that risk is based on the current connection , informed by previous context , and continually reconsidered for future access attempts. Option A is incorrect because Zero Trust does not create a long-lived 30-day trust decision. Option B is incorrect because risk is not universally applied to all enterprise traffic once assessed. Option C is too narrow, since risk is not limited to checking public bad-IP lists. Instead, Zero Trust risk is dynamic and contextual, enabling policy to change uniquely for each request as conditions evolve. That is why the best answer is D .