“Taxable property,” as used in Section 74950, means:
(a) All lands and improvements within a district or improvement district, as the case may be, if the provisions of Section 74056 were complied with in the formation of the district or district within which the improvement district is created.
(b) All lands and improvements within an improvement district if the basis of taxation in the improvement district has been changed pursuant to Section 75151 from land to land and improvements.
(c) Land only within any district or improvement district not mentioned in subdivision (a) or (b) of this section.