A always says Truth, B always lies, C sometimes lies and D is deaf & dumb. Max questions need to ask to determine ABCD?

Question

Consider that,

A – always says Truth
B – always lies
C – sometimes lies
D – deaf and dumb

What is maximum questions you need to ask each to determine who is ABCD?

Answer 1

Ask a question who sometimes lie you will get the answer as A point to C , B point (A ,C, D),C point (A,B,C,D),D is deaf and dumb
So ask only one questions.

Comments

But how from the above question we can decide who is A, B, C & D. Remember you dont know who is A, B, C and D.

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A would say 'Truth' to everything, so ask them if they are A.
B if asked if they were A would lie and say yes, showing they are not.
C ask them the same question, are they A? if they say yes ask again and if they say no they're C.
D just won't hear you so won't be able to answer.
So if you can address them all, it should be at a minimum of 2, as C and B would need to be asked individually.