In the tertiary structure of $DNA$,what is a histone octamer?

• A
  $A$ complex consisting of eight negatively charged histone proteins (two of each $H2A, H2B, H3$ and $H4$) that aid in the packaging of $DNA$.
• B
  $A$ complex consisting of eight positively charged histone proteins (two of each $H2A, H2B, H3$ and $H4$) that aid in the packaging of $DNA$.
• C
  $A$ complex consisting of nine positively charged histone proteins ($H1$ and two of each $H2A, H2B, H3$ and $H4$) that aid in the packaging of $DNA$.
• D
  $A$ complex consisting of nine negatively charged histone proteins ($H1$ and two of each $H2A, H2B, H3$ and $H4$) that aid in the packaging of $DNA$.