Answer :
The given options are evaluated as
follows :
- Networks - Reliability cannot be found as a
product of individual component reliabilities in this arrangement
and hence, this option is rejected .
- Series - In a series arrangement , the
system reliability is a product of individual component reliability
and hence, this option is the correct answer .
- Sequence -Reliability cannot be found as a product
of individual component reliabilities in this arrangement and
hence, this option is rejected .
- Descending order -Reliability cannot be found as a
product of individual component reliabilities in this arrangement
and hence, this option is rejected .
Conclusion : Option “B“
represents the correct answer .