Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
SLOW, UNMU, WPKS, YRIQ, ?
1
WUKO
2
APKO
3
ATGO
4
WTGS
Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
SLOW, UNMU, WPKS, YRIQ, ?