Four statements are given below regarding the nomenclature of organisms. Which two statements are correct?
$(1)$ The first name denotes the species and the second denotes the genus.
$(2)$ $A$ species name used for one organism cannot be used for another organism.
$(3)$ Each word in a handwritten scientific name must be underlined.
$(4)$ It is mandatory to write the sub-species name after the species name for every organism.

• A
  $(1)$ and $(4)$
• B
  $(2)$ and $(4)$
• C
  $(1)$ and $(2)$
• D
  $(2)$ and $(3)$