Which of the following statements about CIP priorities are correct?

A: tert-butyl is $(\mathrm{C},\mathrm{C},\mathrm{C})$ and vinyl is $(\mathrm{C},\mathrm{C},\mathrm{H})$ at the first sphere: true. B: $-\mathrm{CHCl}{}_2$ is $(\mathrm{Cl},\mathrm{Cl},\mathrm{H})$ and $-\mathrm{CH}{}_2\mathrm{Br}$ is $(\mathrm{Br},\mathrm{H},\mathrm{H})$; compare the highest atoms first, $\mathrm{Br}>\mathrm{Cl}$, so $-\mathrm{CH}{}_2\mathrm{Br}$ wins: false. C: $-\mathrm{CD}{}_3$ is $(\mathrm{D},\mathrm{D},\mathrm{D})$ and ethyl is $(\mathrm{C},\mathrm{H},\mathrm{H})$; $\mathrm{C}>\mathrm{D}$ so ethyl wins; isotope mass is a late tie-break only: false. D: both are $(\mathrm{C},\mathrm{C},\mathrm{C})$ at the first sphere; at the next sphere phenyl has branches $\{\mathrm{C},\mathrm{C},\mathrm{H}\}$ while tert-butyl has $\{\mathrm{H},\mathrm{H},\mathrm{H}\}$, so phenyl wins: true. Correct: A and D.