How should a developer implement this feature?

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When a user edits the Postal Code on an Account, a custom Account text field named "Timezone" must be update based on the values in a PostalCodeToTimezone__c custom object.

How should a developer implement this feature?
A . Build an Account Assignment Rule.
B . Build an Account custom Trigger.
C . Build an account Approval Process
D . Build an Account Workflow Rule.

Answer: B