Coherent orthogonal binary FSK modulation is used to transmit two equiprobable symbol waveforms s₁(t) = αcos2πf₁t & s₂(t) = αcos2πf₂t₁ where α = 4 mV. Assume an AWGN channel with two-sided noise power spectral density $$\frac{{{N_0}}}{2} = 0.5 \times {10^{ - 12}}W/Hz.$$     Using an optimal receiver and the relation $$Q\left( v \right) = \frac{1}{{\sqrt {2\pi } }}\int\limits_v^\infty {{\theta ^{\frac{{{u^2}}}{2}}}du,} $$     the bit error probability for a data rate of 500 kbps is

A. Q(2)

B. $$Q\left( {2\sqrt 2 } \right)$$

C. Q(4)

D. $$Q\left( {4\sqrt 2 } \right)$$

Answer: Option C