Which of the following expressions represents Lami's theorem, if A, B, C are three are in equilibrium and as shown in figure.

• A.  \[\frac{A}{\cos \alpha }=\frac{B}{\cos \beta }=\frac{C}{\cos \gamma }\]
• B.  \[\frac{A}{\sin \alpha }=\frac{B}{\sin \beta }=\frac{C}{\sin \gamma }\]
• C.  \[\frac{A}{{{\cos }^{2}}\alpha }=\frac{B}{{{\cos }^{2}}\beta }=\frac{C}{{{\cos }^{2}}\gamma }\]                     
• D.  None of these