Question refers to "legacy system", implying a legacy computer rather than a legacy network? Passive scans are network oriented - not computer oriented. Need a credentialed scan to get down into a computer's vulnerabilities.
From comptia book "A scanning technique to passively test security controls operates by sniffing network traffic to identify assets communicating on the network, service ports used, and potentially some types vulnerabilities."
So, if they key word in this question is "first" then passive scan is the correct answer.
Passive scans are good for identifying asset inventory, and active directory configurations. Passive scanners can monitor activity to determine the network's vulnerabilities.
https://subscription.packtpub.com/book/cloud_and_networking/9781789348019/8/ch08lvl1sec91/credentialed-versus-non-credentialed-scans
Non-credentialed: A non-credentialed scan will monitor the network and see any vulnerabilities that an attacker would easily find; we should fix the vulnerabilities found with a non-credentialed scan first, as this is what the hacker will see when they enter your network.For example, an administrator runs a non-credentialed scan on the network and finds that there are three missing patches.
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