The crystal system with edge lengths $a \neq b \neq c$ and axial angles $\alpha = \beta = \gamma = 90^{\circ}$ is '$x$' and the number of Bravais lattices for it is '$y$'. $x$ and $y$ are:

  • A
    Cubic; $3$
  • B
    Monoclinic; $2$
  • C
    Orthorhombic; $4$
  • D
    Trigonal; $2$

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