The electric field at a point is:
(a) always continuous.
(b) continuous if there is no charge at that point.
(c) discontinuous only if there is a negative charge at that point.
(d) discontinuous if there is a charge at that point.

 
Choose the correct option:

1. (a), (b) 2. (b), (d)
3. (c), (d) 4. (a), (d)