To be eligible for an estate certificate of convenience, a person shall be one of the following:

1. (a) The executor or administrator of the estate of a deceased property broker-agent, casualty broker-agent, or life agent.
2. (b) If no executor or administrator has been appointed, the surviving spouse or heir otherwise entitled to conduct the business of the deceased property broker-agent, casualty broker-agent, or life agent.
3. (c) The conservator of the estate of a property broker-agent, casualty broker-agent, or life agent.