How Many Liars?

A tourist is traveling in a land of liars and truth-tellers. All truth-tellers always tell the truth, and all liars always lie.
The tourist meets four friends: Alice, Betty, John, and Donald, and asks them: "How many of the four of you are liars?"
Alice answers: 0
Betty answers: 1
John answers: 2
Donald answers: 3
Can we know for certain how many of them are liars?

 

Difficulty level (1 very easy - 10 very hard): 1

Topics:
Logic -> Reasoning / Logic Combinatorics -> Case Analysis / Checking Cases -> Processes / Procedures Logic -> Truth-tellers and Liars Problems
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