When Z is doubled in an atom, which of the following statements are consistent with Bohr's theory ?

$\begin{array}{l}{\mathrm{E}}_{\mathrm{n}}\propto {\mathrm{Z}}^2\therefore \mathrm{Z}\mathrm{doubled}\Rightarrow {\mathrm{E}}_{\mathrm{n}}\mathrm{becomes}\mathrm{four}\mathrm{times}.\\ {\mathrm{R}}_{\mathrm{n}}\propto 1/\mathrm{Z}\therefore \mathrm{Z}\mathrm{doubled}\Rightarrow {\mathrm{R}}_{\mathrm{n}}\mathrm{becomes}\mathrm{half}.\\ {\mathrm{V}}_{\mathrm{n}}\propto \mathrm{Z}\therefore \mathrm{Z}\mathrm{doubled}\Rightarrow {\mathrm{v}}_{\mathrm{n}}\mathrm{becomes}\mathrm{two}\mathrm{times}.\end{array}$