For the purposes of this Act, a corporation shall be deemed to be a wholly-owned subsidiary of another corporation if none of the members of the first mentioned corporation is a person other than—

(a) the second-mentioned corporation;

(b) a nominee of the second-mentioned corporation;

(c) a subsidiary of the second-mentioned corporation, being a subsidiary none of the members of which is a person other than the second-mentioned corporation or a nominee of the second-mentioned corporation; or

(d) a nominee of such a subsidiary.