The correct answers are Any user who currently has an issue assigned to them and Members of the engineers group who are assigned issues in the Platform project and have access to that project.

The clause Any user who currently has an issue assigned to them is selected because the JQL contains assignee=currentUser(). When the filter subscription runs for a broad recipient set the currentUser function is evaluated for each recipient. Any recipient who is the assignee on at least one issue will match that part of the query and receive the email.

The clause Members of the engineers group who are assigned issues in the Platform project and have access to that project is selected because the JQL also includes project = "Platform" AND assignee = membersOf("engineers"). That portion only matches engineers who are assigned to issues in the Platform project and who have permission to receive the subscription.

All users who can access the Platform project is wrong because the query does not select every user with project access. The project filter is combined with assignee = membersOf("engineers") which restricts recipients to engineers who are assignees.

All users who have access to the site is wrong because a broad recipient list does not bypass the JQL. Each recipient must match the query either by being the assignee on an issue or by being an engineers member assigned in the Platform project.

All members of the engineers group regardless of whether they are assigned issues is wrong because the membersOf function is coupled with assignee and project. Engineers who are not assigned issues in Platform will not satisfy the query and will not receive the subscription.

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