$\mathrm{Cr}(Z=24)$: $[Ar] \, 3d^5 4s^1$ So, it is not $d^{10}$.

$\mathrm{Fe}(Z=26)$: $[Ar] \, 3d^6 4s^2$ So, it is not $d^{10}$.

$\mathrm{Co}(Z=27)$: $[Ar] \, 3d^7 4s^2$ So, it is not $d^{10}$.

$\mathrm{Ni}(Z=28)$: $[Ar] \, 3d^8 4s^2$ So, it is not $d^{10}$.

$\mathrm{Cu}(Z=29)$: $[Ar] \, 3d^{10} 4s^1$ So, it has $d^{10}$.

$\mathrm{Zn}(Z=30)$: $[Ar] \, 3d^{10} 4s^2$ So, it has $d^{10}$.

$\mathrm{Ag}(Z=47)$: $[Kr] \, 4d^{10} 5s^1$ So, it has $d^{10}$.

$\mathrm{Cd}(Z=48)$: $[Kr] \, 4d^{10} 5s^2$ So, it has $d^{10}$.

$\mathrm{Pd}(Z=46)$: $[Kr] \, 4d^{10} 5s^0$ So, it has $d^{10}$.

Option A: $\mathrm{Pd}, \mathrm{Ni}, \mathrm{Fe}, \mathrm{Cr}$

• Pd is $d^{10}$
• Ni is not $d^{10}$
• Fe is not $d^{10}$
• Cr is not $d^{10}$ Hence, incorrect.

Option B: $\mathrm{Cu}, \mathrm{Zn}, \mathrm{Cd}, \mathrm{Ag}$

• Cu is $d^{10}$
• Zn is $d^{10}$
• Cd is $d^{10}$
• Ag is $d^{10}$ Hence, correct.

Option C: $\mathrm{Co}, \mathrm{Ni}, \mathrm{Fe}, \mathrm{Cr}$ None of these are $d^{10}$. Hence, incorrect.

Option D: $\mathrm{Ni}, \mathrm{Cr}, \mathrm{Fe}, \mathrm{Cu}$ Only Cu is $d^{10}$. Hence, incorrect.