Which of the following are the features of public goods?

Non-Rivalrous and non-excludable.

The correct answer is Option (3) → Non-Rivalrous and non-excludable.

Public goods are those goods that are available for everyone’s use and cannot be restricted to specific individuals.

• Non-rivalrous: Consumption by one person does not reduce the availability of the good for others.
  Example: One person’s enjoyment of street lighting does not reduce the light available to others.

• Non-excludable: It is not possible to exclude anyone from using the good once it is provided.
  Example: National defence protects all citizens, not just those who pay for it.

Hence, public goods are non-rivalrous and non-excludable.