The correct answer is All of the listed reasons could cause the problem.

This choice is correct because each of the other options describes a plausible reason why Maya might stop receiving subscription emails. Subscriptions deliver the results of a saved filter to recipients on a schedule and if the filter yields nothing to send or if Maya loses the access that makes her a recipient then the emails can stop.

The saved filter yields no results is not a valid exclusion because if a saved filter returns no issues there is often nothing for the subscription to include and many systems will not send an empty notification email.

Someone removed Maya from a user group is not a valid exclusion because if the subscription targets that group then removing her from the group will remove her from the recipient list and she will no longer get the emails.

Project permissions were changed is not a valid exclusion because changes to project or project browsing permissions can prevent a user from seeing issues or receiving notifications tied to that project, so notifications can stop when permissions are reduced.

Someone removed Maya from a project role is not a valid exclusion because project roles are often used to determine notification recipients and access, and removing her from a role can also stop both visibility and email delivery.

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