The bond required of a guardian of a minor or a person who is incapacitated shall be conditioned substantially as follows:
a. To administer the ward's estate to the best of the guardian's ability, and to take proper care of the ward if the guardian is the guardian of the ward's person;
b. To make a just and true account of the administration of the guardianship, and, if required by the court, to settle the accounts therein within the time so required.