The correct answer is C. There are 3 proposition symbols in artificial intelligence.
A proposition symbol is a symbol that represents a proposition, which is a statement that is either true or false. The three proposition symbols in artificial intelligence are:
- $p$: This symbol represents the proposition “It is raining.”
- $q$: This symbol represents the proposition “It is snowing.”
- $r$: This symbol represents the proposition “It is cloudy.”
These three proposition symbols can be combined to form more complex propositions. For example, the proposition “It is raining and snowing” can be represented as $p \land q$. The proposition “It is raining or snowing” can be represented as $p \lor q$. And the proposition “It is not raining” can be represented as $\neg p$.
Proposition symbols are a fundamental part of artificial intelligence. They are used to represent the knowledge that is used by AI systems to make decisions.