Assertion (A): PSLV is ISRO's reliable mainstay launch vehicle. Reason (R): PSLV's flexibility allows multi-payload launches to multiple orbits with excellent reliability.

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1. **A is true.** $PSLV$ (Polar Satellite Launch Vehicle) has many successful flights and is a dependable launcher for ISRO.

2. **R is true.** PSLV can deploy multiple satellites and place them into different orbits in one mission.

3. **R explains A.** This multi-payload, multi-orbit flexibility, combined with its track record, makes PSLV a reliable mainstay.

4. **Conclusion:** Both statements are true and the reason explains the assertion.

FINAL_ANSWER: a

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