How can an administrator discover who added a field to the account page layout?

The best approach for an administrator to discover who added a field to the account page layout is to download the Setup Audit Trail. The Setup Audit Trail provides a comprehensive log of changes made to the organization’s setup, including the creation, modification, and deletion of various metadata components, such as fields and page layouts. By examining this audit trail, an administrator can find specific entries that detail when the field was added and which user was responsible for that action. This tool is essential for tracking configuration changes and security audits within the system.

The other options, while useful in different contexts, do not provide the necessary information. Polling members in the Admin Chatter group, for instance, may lead to insights but lacks the authoritative documentation needed for confirming changes. Running an Account History report focuses on standard field values and changes to records rather than the setup configurations, and reviewing the Last Modified By field on an Account record pertains to changes in the record itself, not changes to the page layout or schema. Thus, the Setup Audit Trail is specifically designed for administrative tracking of all setup changes, making it the most reliable resource for this inquiry.