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Two point source separated by $d = 5\, \mu m$ emit light of wavelength $\lambda = 2\, \mu m$ in phase.Acircular wire of radius $20\, \mu m$ is placed around the source as shown in figure.

• A
  Point $A$ and $B$ are dark and points $C$ and $D$ are bright.
• B
  Points $A$ and $B$ are bright and point $C$ and $D$ are dark.
• C
  Points $A$ and $C$ are dark and points $B$ and $D$ are bright.
• ✓
  Points $A$ and $C$ are bright and points $B$ and $D$ are dark.