Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
PND, QKI, RHN, SES, ?
1
SCX
2
SXC
3
TBX
4
TXB
Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
PND, QKI, RHN, SES, ?