Zero orbital debris mission accomplished by ISRO's POEM-3 mission

Current Context: The Indian Space Research Organisation (ISRO) achieved a significant milestone with its PSLV Orbital Experimental Module-3 (POEM-3) mission.

• The mission was launched on January 1, 2024, and it successfully met its fiery end through a re-entry into the Earth’s atmosphere on March 21, 2024.
• This mission has practically left zero debris in orbit.
• The POEM-3 was used as an orbital experimental module for ISRO’s X-ray Polarimeter Satellite (XPoSAT) mission.
• This was the third time PSLV’s spent fourth stage (PS4) was used as an orbital experimental module.
• As a stabilised platform, the PS4 stage orbited the Earth.
• ISRO, being a responsible space agency, is committed to mitigating the threat of space debris through the development and implementation of advanced debris tracking systems and space-object deorbiting.

Question:

Q.1 What is the name of the mission launched by ISRO that left practically zero debris in orbit?
a. POEM-1
b. POEM-3
c. POEM-2
d. POEM-4