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In the design of beams for a given strength, consider that the conditions of economy of use of the material would avail as follows:

1.   Rectangular cross-section is more economical than square section of the same cross-sectional area of the beam.

2.   Circular section is more economical than square section.

3.   I-section is more economical than a rectangular section of the same depth.

         Which of the above are correct?

         (a) 1, 2 and 3                  (b) 1 and 2 only

         (c) 2 and 3 only              (d) 1 and 3 only

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