A) Gauss's law of magnetism is given by $\alpha\oint B.ds=0$
B) An EM wave is a wave radiated by a charge at rest and propagates through electric field only
C) A time varying electric field is a source of changing magnetic field
D) Faraday's law of EM induction is $\oint E.dl=-\frac{d\phi_{B}}{dt}$