Which type of unit cell from the following is | vedclass

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(A) The seven crystal systems are Cubic,Orthorhombic,Tetragonal,Monoclinic,Triclinic,Rhombohedral,and Hexagonal.By observing the Bravais lattices for

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Simple

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(A) The seven crystal systems are Cubic,Orthorhombic,Tetragonal,Monoclinic,Triclinic,Rhombohedral,and Hexagonal.By observing the Bravais lattices for these systems,we find that the 'Simple' (or primitive) unit cell is present in all seven crystal systems.| Sr. No. | Type of System | Bravais lattices present || :--- | :--- | :--- || $1$ | Cubic | Simple,Face-centered,Body-centered || $2$ | Orthorhombic | Simple,Base-centered,Face-centered,Body-centered || $3$ | Tetragonal | Simple,Body-centered || $4$ | Monoclinic | Simple,Base-centered || $5$ | Triclinic | Simple || $6$ | Rhombohedral | Simple || $7$ | Hexagonal | Simple or primitive |

Column $I$	Column $II$
$(A)$ Simple cubic and face-centred cubic	$(p)$ have these cell parameters $a=b=c$ and $\alpha=\beta=\gamma=90^{\circ}$
$(B)$ Cubic and rhombohedral	$(q)$ are two crystal systems
$(C)$ Cubic and tetragonal	$(r)$ have only two crystallography angles of $90^{\circ}$
$(D)$ Hexagonal and monoclinic	$(s)$ belong to same crystal system

Which type of unit cell from the following is common to all seven types of crystal systems?

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