How many types of Bravais lattices are there?

In a tetragonal crystal system,which of the following conditions is correct?

Explain the concepts of motif and space lattice.

The crystal system of a compound with unit cell dimensions $a = 0.387 \ nm$,$b = 0.387 \ nm$ and $c = 0.504 \ nm$ and $\alpha = \beta = 90^{\circ}$ and $\gamma = 120^{\circ}$ is:

How many types of unit cells are found in a primitive cubic unit cell?

Find the Weiss indices for the plane $(231)$.