What is the primary advantage of Electronic Fuel Injection (EFI) over a carburetor for mixing air and fuel?

1. EFI is mechanically simpler and has fewer electronic components
2. EFI uses sensors and an ECU to continuously adjust the air-fuel ratio for better efficiency, emissions control, and cold starting
3. EFI does not require any fuel pump to deliver fuel to the engine
4. EFI eliminates the need for spark plugs in petrol engines