Assume that the silicon diode in the circuit requires a minimum current of 1 m A to be above the knee point (0.7 V) of I-V characteristics. Also assume that the voltage across the diode is independent of current above the knee point. If \[{{V}_{B}}\]= 5 V, then the maximum value of R so that the voltage is above the knee point is

• A. \[4.3k\Omega \] 
• B. \[2\,k\Omega \]
• C. \[1\,\Omega \]               
• D. 0