Which one of the following configurations represents a noble gas?

Which one of the following configuration represents a noble gas ?

Which one of the following configuration represents Ar. ?

Which of the following configuration represents a therosteroisomer?

Which of the following configuration represents an erythrostereoisomer?

Which of the following cations posses neither noble gas nor pseudo noble gas configurations? (i) Bi^(3+) (ii) Pb^(2+) (iii) Sn^(2+) (iv) Tl^(+)

Which electronic configuration corresponds to a noble gas?