Which of the following is regarded as the ‘repeatable entity’ of a 3D crystal structure?

Which of the following is regarded as the ‘repeatable entity’ of a 3D crystal structure? Correct Answer Unit cell

Unit cell is the smallest entity of a crystal lattice which, when repeated in space (3 dimensions) generates the entire crystal lattice. Lattice comprises of the unit cells which hold all the particles in a particular arrangement in 3 dimensions. Crystal is a piece of homogenous solid and Bravais indices are used to define planes in crystal lattices in the hexagonal system.
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