16. As shown in Figure 14,
$\odot \mathrm{O}_{1}$ and $\odot \mathrm{O}_{2}$ intersect
at points $A$ and $B$, $\bigcirc \mathrm{O}_{2}$
passes through $\odot O_{1}$, and $A C$ and $A D$
are diameters of $\odot \mathrm{O}_{1}$ and $\odot \mathrm{O}_{2}$
respectively. Then the following conclusions:
(1) $C, B, D$ are collinear;
(2) $A D = C D$;
(3) $A C^{2} - C B^{2} = A D^{2} - B D^{2}$

which of the following is correct? 
(A) Only (1);
(B) (1) and (3);
(C) (2) and (3);
(D) (1) and (2);
(E) All correct.
$\mathrm{E}$