Step 1: Identify the task.
We must pick the conclusion that can be safely deduced from the passage about gig workers, the 90-120 day threshold, and aggregators.
Step 2: Test option 1.
"All gig workers are automatically eligible" is too sweeping; the passage attaches eligibility to a days threshold, so automatic eligibility for all is not supported.
Step 3: Test option 2.
The passage treats the day-count as cumulative across platforms, not a fresh 120 days on each platform, so this option misreads the rule.
Step 4: Test option 3.
Claiming similar platforms like Blinkit and Flipkart are not covered contradicts the spirit of the Code, which extends to such aggregators, so it is unsupported.
Step 5: Test option 4.
The passage says the framework is the Code on Social Security and that state rules take cues from the central ones, which confirms the Code is given by the central government.
Step 6: Conclude.
Only option 4 is firmly backed by the text.
\[ \boxed{\text{Code of Social Security is given by the central government}} \]