Final answer:
A public park is an example of a product that is both non-excludable and non-rival in consumption because it's open to everyone and one person's use does not prevent others from enjoying it.
Step-by-step explanation:
Among the options given, a public park is an example of a product that is both non-excludable and non-rival in consumption. Non-excludable goods are those that people cannot be prevented from using; they are available to everyone.
For example, police protection is difficult to exclude individuals from once it is provided, making it non-excludable. Roads are typically open for everyone to use and it's difficult to exclude people from them, although some roads like toll roads can exclude non-payers. By contrast, products like a private car, a subscription-based streaming service, and homemade meals are excludable because they can be restricted to paying customers or owners only.
A non-rival product is one where one person's use does not diminish the ability of others to use it. Public radio is an example of this; one person's listening does not prevent others from doing so. In contrast, a slice of pizza or ice cream cone is rivalrous, because once consumed, they cannot be enjoyed by another. Therefore, the public park is both non-excludable and non-rival, as it is open for all to enjoy without reducing others' enjoyment.