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To enable FileVault on a Mac, a local admin account is required because FileVault is a disk encryption program designed to protect data by encrypting the entire drive and ensuring that only authorized users can access the contents of the drive.

A local admin has the necessary privileges to make system-wide changes and configurations, including enabling or disabling features like FileVault. This level of access allows the admin to manage user permissions and encryption settings effectively.

Other account types would not have the necessary administrative privileges: a guest account lacks the ability to make system-level changes, a standard user does not have sufficient rights to enable disk encryption, and a network admin access is typically remote and does not apply to local machine settings directly. Thus, only a local admin has the appropriate level of access needed to enable FileVault on a Mac.