Select the combination of letters that when sequentially placed in the blanks of the given series, will complete the series.
P _ _ PO _ P _ P _ OP
1
POPPO
2
POOOP
3
OOOPP
4
OPPOP
Select the combination of letters that when sequentially placed in the blanks of the given series, will complete the series.
P _ _ PO _ P _ P _ OP