Explanation:

- Implicit costs are not like explicit costs, which involve direct payment of money. They represent the value of resources used in production that do not involve a direct monetary payment.

- Explicit costs are the actual payments a company makes, like wages and materials. Therefore, implicit costs are not the same as explicit costs.

- Total cost includes both explicit and implicit costs, but implicit cost itself is not the total cost.

- Opportunity costs refer to the potential benefits an individual, investor, or business misses out on when choosing one alternative over another. Implicit costs are often seen as opportunity costs because they reflect the earnings foregone by using a resource in a different way.

- Imputed costs are costs that are not directly paid or incurred but are relevant for decision-making. Implicit costs are indeed similar to imputed costs.

- Correct Answer: Option 4 - Imputed costs