For an orthorhombic crystal system,the axial lengths are $a \neq b \neq c$. What are the axial angles?
- A$\alpha = \beta = \gamma \neq 90^\circ$
- B$\alpha = \beta = \gamma = 90^\circ$
- C$\alpha = \gamma = 90^\circ, \beta = 120^\circ$
- D$\alpha \neq \beta \neq \gamma \neq 90^\circ$
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