In a monoclinic unit cell, the relation of sides and angles are respectively:

$\displaystyle \mathrm{a}=\mathrm{b} \neq \mathrm{c}$ and $\displaystyle \alpha=\beta=\gamma=90^{\circ}$

$\displaystyle \mathrm{a} \neq \mathrm{b} \neq \mathrm{c}$ and $\displaystyle \alpha=\beta=\gamma=90^{\circ}$

$\displaystyle \mathrm{a} \neq \mathrm{b} \neq \mathrm{c}$ and $\displaystyle \beta=\gamma=90^{\circ} \neq \alpha$

$\displaystyle \mathrm{a} \neq \mathrm{b} \neq \mathrm{c}$ and $\displaystyle \alpha \neq \beta \neq \gamma \neq 90^{\circ}$