[Solved] Infectious naked strands of RNA are called A)viroids. B)phages. C)prions. D)oncogenic viruses. E)spikes. Period Cost: Costs that are not directly tied to the production process and are expensed in the period in which they are incurred, such as selling and administrative expenses. Advertising Cost: The expense incurred by an entity to promote its products, services, or brand through various media channels. Production Equipment: Machinery and tools used in the manufacturing process to produce finished goods. Factory Supervisor: A role responsible for overseeing the operation of a manufacturing facility, including managing employees and ensuring production targets are met.