A 2 unit high marble slab with a 1 unit \( \times 4 \) unit base is fixed to the floor of a cour...

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A 2 unit high marble slab with a 1 unit \( \times 4 \) unit base is fixed to the floor of a courtyard. Find the surface area of the marble which is visible.
a. 28 sq. units
b. 26 sq. units
c. 24 sq. units
d. 16 sq. units
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