(A) The shape of an orbital is determined by the azimuthal quantum number $(l)$.For $s$-orbitals,$l = 0$,which corresponds to a spherical shape.For $p

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(A) The shape of an orbital is determined by the azimuthal quantum number $(l)$.For $s$-orbitals,$l = 0$,which corresponds to a spherical shape.For $p$-orbitals,$l = 1$ (dumbbell shape).For $d$-orbitals,$l = 2$ (double dumbbell shape).For $f$-orbitals,$l = 3$ (complex shape).Therefore,the $4s$ sub-shell is spherical.