Verified Answer :

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In electrical work, resistance is often represented by the Greek symbol Ω. The correct option among all the options that are given in the question is the first option or option "a". It is actually a Greek Letter Omega and is written in upper case. I hope this is the answer you were looking for and it has helped you.

Answer : The correct option is, (a) Greek symbol O

Explanation :

Resistance : It is defined as the property of a material which resist the flow of charges through it.

Resistance is represented as, Ohm, \(\Omega\) (in symbol) and uppercase Omega (in Greek symbol).

Hence, in electrical work, resistance is often represented by the  Greek symbol O.