Explanation:

- Option 4: Imputed costs

- Implicit costs are indeed similar to imputed costs. These are indirect costs, not recorded directly in financial accounts, but representing the opportunity cost of using resources.

- Option 1: Same as explicit costs

- Explicit costs are direct, out-of-pocket payments like wages and rent. These are easily recorded in financial statements, unlike implicit costs.

- Option 2: Total cost

- Total cost is the sum of explicit and implicit costs. It represents the complete expenditure to produce goods or services.

- Option 3: Opportunity costs

- Implicit costs are also known as opportunity costs. They reflect what one foregoes when choosing to use resources in a particular way instead of the next best alternative.