This question tests knowledge of a specific timeline built into the Uniform Civil Code Rules, Uttarakhand, 2025, for escalating an unattended application for declaration of legal heirs to a higher authority.
Among the three specific timeframes offered, only thirty days corresponds to the escalation period the Uttarakhand UCC Rules, 2025 actually prescribe for forwarding an inactive application to the Registrar General.
Therefore, the correct answer is After thirty days of receipt if the Registrar does not take action.