Consider the situation shown in diagram:

Observer hears sound from car directly and also after reflection from the wall. Choose the CORRECT statement(s) :

For ${\mathrm{V}}_{\mathrm{A}}={\mathrm{V}}_{\mathrm{B}}={\mathrm{V}}_{\mathrm{C}},$ beat frequency heard by observer may be zero.

If ${\mathrm{V}}_{\mathrm{B}}\ne 0,$ observer will surely hear beat for any value of ${\mathrm{V}}_{\mathrm{A}} \mathrm{\&} {\mathrm{V}}_{\mathrm{C}}.$

If ${\mathrm{V}}_{\mathrm{B}}={\mathrm{V}}_{\mathrm{C}}=0$, then beat frequency heard by observer is zero irrespective of V_A.

If V_A = 0, beat frequency heard by observer is zero irrespective of ${\mathrm{V}}_B \mathrm{\&} {\mathrm{V}}_{\mathrm{C}}.$