Which of the following are the correct axial distance and axial angles for rhombohedral system?

• Correct answer
  A

  $\mathrm{a}=\mathrm{b}=\mathrm{c},\mathrm{\alpha }=\mathrm{\beta }=\mathrm{\gamma }\ne 90°$
• B

  $\mathrm{a}=\mathrm{b}\ne \mathrm{c},\mathrm{\alpha }=\mathrm{\beta }=\mathrm{\gamma }=90°$
• C

  $\mathrm{a}\ne \mathrm{b}\ne \mathrm{c},\mathrm{\alpha }=\mathrm{\beta }=\mathrm{\gamma }=90°$
• D

  $\mathrm{a}\ne \mathrm{b}\ne \mathrm{c},\mathrm{\alpha }\ne \mathrm{\beta }\ne \mathrm{\gamma }\ne 90°$

Hence, the correct answer is option: 'A'.