As Rodolfo works on a multiplication problem in his head, the numbers he is manipulating are in his memory, and the multiplication tables he uses are pulled from his memory.

Working memory and long term memory  

Explanation:

The part of short-term memory that deals with the linguistic and conscious perceptual processing is called working memory. It has limited capacity and holds the information the is available for processing.  It is required for guidance of behaviour, decision making and reasoning. It lasts for only 10 to 15 seconds. e.g when we try to remember the recepie and steps while cooking a dish.

Long term memory is the final stage of Atkinson-shiffrins multi stage model . It retains skills and information for longer periods. It can store unlimited information as it doesn't decays over time. the formation of long term memory involves changes in the physical structure of nerve cell. This process is called long term potentate.  

There are three types of long term memories: Episodic, Semantic and procedural.  

The tables used by Rodolfo are stored in his long term memory but since he would be using the number for few seconds it is dealt by working memory.

the answer is a. or c.

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