Which statements about the different types of atomic and ionic radii are correct?

1. AThe van der Waals radius of a non-metal like chlorine is larger than its covalent radius.
2. BThe ionic radius of $\mathrm{Cl}{}^{-}$ is smaller than the covalent radius of $\mathrm{Cl}$.
3. CThe covalent radius of chlorine is half the $\mathrm{Cl}-\mathrm{Cl}$ bond length in $\mathrm{Cl}{}_2$.
4. DThe radii of noble gases other than those in compounds are quoted as van der Waals radii.