Match the crystal system / unit cells mentioned in Column I with their characteristic features mentioned in Column II. Indicate your answer by darkening the appropriate bubbies of the `4xx4` matrix given in the ORS.
`{:(,"Column I",,"Column II"),((A),"Simple cubic and face - centred cubic",(p),"have these cell parameters a = b = c and " alpha = beta = gamma),((B),"cubic and rhombohedral",(q),"are two crystal systems"),((C ),"cubic and tetragonal",(r ),"have only two crystallography angles of " 90^(@)),((D),"hecagonal monoclinic",(s),"belong to same crystal system"):}`

Explanation

To solve the problem of matching the crystal systems with their characteristic features, we will analyze each option in Column I and match it with the appropriate feature in Column II.

### Step-by-Step Solution:

1. **Identify the features of Simple Cubic and Face-Centered Cubic (FCC)**:
- Both Simple Cubic and FCC have the same cell parameters: \( a = b = c \) and \( \alpha = \beta = \gamma = 90^\circ \).
- They belong to the cubic crystal system.

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