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Which of the following is true about shielded metal arc welding?

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Which of the following is true about shielded metal arc welding?

(a) equipment cost is high

(b) cannot weld different types of  metals

(c) cannot be used for metal sheets under 1.5mm thickness

(d) entire electrode can be used

I had been asked this question by my school principal while I was bunking the class.

My query is from Welding Process in portion Welded Connections of Design of Steel Structures

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The correct option is (c) cannot be used for metal sheets under 1.5mm thickness

For explanation: The following are some advantages of shielded metal arc welding : (i)low equipment cost, (ii)welds many different metals, (iii)welds can be performed in any position, (iv)process less affected by wind, (v)can be performed under most weather conditions. SomeThe disadvantages are : (i)not suitable for metal sheets under 1.5mm thickness,(ii) entire electrode cannot be used, about 25-50mm electrode is wasted.

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