What is the closed$-$world hypothesis?

Group of answer choices

The closed$-$world hypothesis states that a self$-$aware artificial intelligence has wiped most of humanity from the Earth except for those it enslaves in a virtual reality system as a farmed power source. Basically, the plot of the Matrix.

The closed$-$world hypothesis states that all facts are false.

The closed$-$world hypothesis states that all logical formulas that are not logical consequences of the formulas that are written in a logic program are false.

The closed$-$world hypothesis states that the truth value of a statement may be true irrespective of whether or not it is known to be true.