Using the database depicted below,how many primary keys are in the database? 
Definitions:
Concrete Operational
A stage in cognitive development, according to Piaget, where children aged approximately 7 to 12 years can think logically about concrete events.
Cognitive Development
The process by which a child learns to understand the world around them through problem-solving, memory, and decision-making from infancy through adolescence.
Piaget
A Swiss psychologist known for his theory of cognitive development that describes how children construct a mental model of the world.
Cognitive Development
Cognitive Development concerns the growth and change in mental abilities over time, including learning, memory, problem-solving, and decision-making.
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