Many factories employ 'Badli' workers. Who are these workers?

Substitute workers

The correct answer is Option 2: Substitute workers

'Badli' workers are those who are employed as substitutes for permanent workers when they are absent or on leave. They do not have permanent status and are usually hired on a temporary basis. They are commonly found in industrial and factory settings, especially in India, and are not entitled to the full range of benefits that permanent employees receive.