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Which one of these expressions represent an area?

I am confused about which expressions represent an area. a, b and c represent lengths
 
1. a(ab+bc)
2. a^2b
3. c(a+b)
4. 4(a+c)

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Avery A. | Math and Physics Tutor Specializing in Academic CoachingMath and Physics Tutor Specializing in A...
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For 1.  the final unit is length cubed (volume) - not possible area
For 2.  we don't know the magnitude of b; if b=2, - this is an area
For 3.  the final unit is length squared - possible area!!
For 4.  the final unit is length - not possible area
Let me know if this helps any.