By default, who will receive an email when a secret has been detected in a...

GitHub explicitly notifies the commit author when that person accidentally commits a detected secret, regardless of the author's notification preferences. Repository administrators are also among the users eligible to receive secret-scanning security notifications, subject to their repository watch and email notification configuration. GitHub's current notification model can additionally notify security managers and users with explicitly granted security-alert access, but those choices are not represented accurately by the generic “security analyst” option. Write and Maintain roles alone do not make a user the default repository-wide recipient represented by this question. For incremental scans, users who have security-alert access receive notifications according to their configured notification preferences, while commit authors receive notification regardless. Therefore, among the supplied choices, the expected combination remains the committer and repository administrators: B and C.