Explanation:

- Presumption of facts: These are inferences that a court can draw based on ordinary human experiences or evidence presented. They are not fixed rules and can vary depending on the context.

- Presumptions of law: These are established legal principles that must be applied when certain facts are proven. They are often more rigid and codified in statutes.

- Option 1: Only presumption of facts.

- Option 2: Only presumptions of law.

- Option 3: Both (a) & (b). Presumptions under the law of evidence include both presumptions of facts and law.

- Option 4: Only presumptions of law, excluding facts.

Correct Answer: Option 3 - Both (a) & (b)

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