What specific property of cosmic X-rays does the XPoSat (X-ray Polarimeter Satellite) mission by ISRO primarily aim to study?

With reference to the PSLV-C45 mission, consider the following statements: I. EMISAT is an advanced electronic intelligence satellite jointly developed by ISRO and DRDO for electromagnetic spectrum measurement. II. In this mission, the PS4 stage was used as an orbital platform carrying payloads such as AIS, APRS and ARIS. III. The mission marked the first use of the PSLV-DL variant with two strap-on boosters and placed payloads in only two different orbits. Select the correct answer using the code given below.

In which year was India's Chandrayaan-1 mission launched?