"insolvent"

means—

(a)any person whose estate is under sequestration in terms of the Insolvency Act, 1936 (Act No. 24 of 1936);
(b)any insolvent deceased estate which is dealt with in terms of the provisions of section 34 (5) of the Administration of Estates Act, 1965 (Act No. 66 of 1965);
(c)any juristic person in liquidation which is unable to pay its debts;
(d)any person whose estate is dealt with in terms of section 28 (5) of the Agricultural Credit Act, 1966 (Act No. 28 of 1966);