Consider the following statements in the case of Young's double-slit experiment:
$(1)$ $A$ slit is necessary if we use an ordinary extended source of light.
$(2)$ $A$ slit is not necessary if we use an ordinary but well-collimated beam of light.
$(3)$ $A$ slit is not needed if we use a spatially coherent point source of light.
Which of the above statements is true?

• A
  $(1), (2)$ and $(3)$
• B
  $(1)$ and $(2)$ only
• C
  $(2)$ and $(3)$ only
• D
  $(1)$ and $(3)$ only