'Burden of proof' which places the responsibility on the party making an affirmative claim to substantiate it with evidence.
The Latin legal term 'onus probandi' translates directly to the 'burden of proof'.
This principle signifies the obligation placed upon a party involved in a legal dispute. Specifically, it requires the party making an affirmative claim or assertion to present sufficient evidence to substantiate that claim.
In essence, the party asserting something must prove it. This responsibility is crucial for establishing the facts of a case.
Option 1 correctly identifies 'onus probandi' as the 'burden of proof' and describes its function accurately.