(a) A premarital agreement is not enforceable if the party against whom enforcement is sought proves either of the following:

(1) That party did not execute the agreement voluntarily; or

(2) the agreement was unconscionable when such agreement was executed and, before execution of the agreement, all of the following applied to that party:

(A) Such party was not provided a fair and reasonable disclosure of the property or financial obligations of the other party;

(B) such party did not voluntarily and expressly waive, in writing, any right to disclosure of the property or financial obligations of the other party beyond the disclosure provided; and

(C) such party did not have, or reasonably could not have had, an adequate knowledge of the property or financial obligations of the other party.

(b) If a provision of a premarital agreement modifies or eliminates spousal support and that modification or elimination causes one party to the agreement to be eligible for support under a program of public assistance at the time of separation or marital dissolution, a court, notwithstanding the terms of the agreement, may require the other party to provide support to the extent necessary to avoid that eligibility.

(c) An issue of unconscionability of a premarital agreement shall be decided by the court as a matter of law.