(a) The certificate must be executed and acknowledged:
(1) by each individual whose name is required to be stated in the certificate or the individual's representative or attorney-in-fact; and
(2) under oath on behalf of each person whose name is required to be stated in the certificate and who is not an individual, by:
(A) the person's representative or attorney-in-fact; or
(B) a joint venturer, general partner, trustee manager, officer, or other person having authority regarding the person comparable to the person's representative or attorney-in-fact.
(b) A certificate executed and acknowledged by an attorney-in-fact must include a statement that the attorney has been authorized in writing by the attorney's principal to execute and acknowledge the certificate.