Select the letter cluster that can replace the question mark (?) in the following series.
RAP, SCS, TEV, UGY, ?
+1, +2 and +3 will be done in a respective manner to transform one letter cluster to the other one.
RAP ==>Â R+1 A+2Â P+3 ==> SCS
SCS ==> S+1Â C+2Â S+3 ==> TEV
TEV ==> T+1 E+2 V+3 ==> UGYÂ
UGY ==>Â U+1Â G+2Â Y+3 ==> VIB
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