In joint-product costing and analysis, which one of the following costs is relevant when deciding the point

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Question:

In joint-product costing and analysis, which one of the following costs is relevant when deciding the point at which a product should be sold to maximize profits?

Separable costs after the split-off point.
Joint costs to the split-off point.
Sales salaries for the period when the units were produced.
Purchase costs of the materials required for the joint products.