  Using superspace projection operators we provide a classification of (3/2,2)
off-shell supermultiplets which are realized in terms of a real axial vector
superfield, with or without compensating superfields. Any linearized
supergravity action is shown to be a superposition of those corresponding to
(i) old minimal supergravity, (ii) new minimal supergravity and (iii) the novel
(3/2,2) off-shell supermultiplet with 12+12 degrees of freedom obtained in
hep-th/0201096.
