Any electromagnetic disturbance is bound to travel at a velocity of

• A. Velocity of light in vacuum
• B. \(\frac{1}{{\sqrt {{\mu _0}{\varepsilon _0}} }}\)
• C. \(\frac{1}{{{\mu _0}{\varepsilon _0}}}\)
• D. \(\frac{1}{{\sqrt {\mu \varepsilon } }}\)