What is the colour of certification tag for certified

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.

OA, LG, IM, FS, (?)

Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.

Select the combination of letters that when placed sequentially in the blanks of the given letter series will complete the series.

Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

D H_ R V _ _ M _V D _ _ R V

Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.

Select the combination of letter that when sequentially placed in the blanks of the given series will complete the series.

Select the combination of numbers that when placed sequentially in the blanks of the given series will complete the series.

Select the number combination of letters that when placed sequentially in the blanks of the given series will complete the series.

Select the combination of numbers that when placed sequentially in the blanks of the given series will complete the series.

Select the correct combination of the letters that when sequentially placed in the blanks of the given letter series will complete the series.