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What do we mean by expression substitution?

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What do we mean by expression substitution?

(a) Embedding the value of Ruby expression into a string using #{  }

(b) Substituting string functions

(c) Storing string value

(d) None of the mentioned
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Right answer is (a) Embedding the value of Ruby expression into a string using #{  }

Explanation: Strings are displayed #{} sequence.
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