Step 1: Understand the question.
We need the drone system made by Solar Defence and Aerospace Limited (SDAL).
Step 2: Identify the system.
SDAL developed Bhargavastra, an indigenous loitering munition drone. A loitering munition can hover, search for a target and then strike it.
Step 3: Why it matters.
It supports India's goal of self-reliant defence and reduces dependence on imported weapons.
Step 4: Rule out others.
Archer is linked to DRDO programmes. Netra is a surveillance UAV from DRDO and IdeaForge. Rudrastra is not the SDAL system here.
Step 5: Conclude.
The correct answer is Bhargavastra.
Answer: Bhargavastra