Question

Which of the following is/are correct? 1.  Displacement current can exist in vacuum 2.  Magnetic field can exist without electric field 3.  Changing electric field necessarily produces magnetic field 4.  Displacement current is not a real current because it involves no charge transport

A 1, 2, and 3
B 1, 2, 4
C 2 and 4
D All of the above
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