Which of the following groups of crystal systems has the crystallographic axes $a=b\ne c?$

The groups of crystal systems that have the crystallographic axes  $a=b\ne c$ is Hexagonal, Tetragonal

According to the potential relationships of the crystal axes, there are seven different types of crystals: cubic, tetragonal, orthorhombic, trigonal, hexagonal, monoclinic, and triclinic.