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Which of the following are correct on regular expressions? a. \varphi + L = L + \varphi = L b. \epsilon L = L\epsilon = L c. \varphi L = L\varphi = \varphi d. \varphi L = L\varphi = L Choose the correct answer from the options given below: | Watch the step-by-step video solution for this NIMCET PYQ.