Piper's teacher asks the class, "What is 5 times 7?" According the network model, the numbers 5 and 7 are currently activated and reside in which of Piper's memory systems?

A) short-term memory
B) long-term memory
C) working memory.
D) sensory memory

C) working memory. As Piper considers the question, the numbers 5 and 7 are brought into working memory, and then the operation of multiplication is used to produce the result.