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

A complex consisting of eight negatively charged histone proteins (two of each ${\mathrm{H}}_2\mathrm{A}, {\mathrm{H}}_2\mathrm{B}, {\mathrm{H}}_3 \mathrm{and} {\mathrm{H}}_4$) that aid in the packaging of DNA.

A complex consisting of nine positively charged histone proteins (H₁ and two of each ${\mathrm{H}}_2\mathrm{A}, {\mathrm{H}}_2\mathrm{B}, {\mathrm{H}}_3 \mathrm{and} {\mathrm{H}}_4$) that aid in the packaging DNA.

A complex consisting of eight positively charged histone proteins (two of each ${\mathrm{H}}_2\mathrm{A}, {\mathrm{H}}_2\mathrm{B}, {\mathrm{H}}_3 \mathrm{and} {\mathrm{H}}_4$) that aid in the packaging of DNA.

A complex consisting of nine negatively charged histone proteins (H1 and two of each ${\mathrm{H}}_2\mathrm{A}, {\mathrm{H}}_2\mathrm{B}, {\mathrm{H}}_3 \mathrm{and} {\mathrm{H}}_4$) that aid in the packaging of DNA.