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Option 3 : RPSQ
Correct option - 3
Clearly, the passage needs a character to start its context. Hence, we should start it with R which gives the introductory and main character of the context that is "fastag". We cannot start with either S or Q because they don't provide the full name of the character. Hence, options 2 & 4 are eliminated. Now, in option 1, sequence SP is incorrect, because full name of RFID is given in P but abbreviation is mentioned in S that is given before. This pattern is incorrect. Hence, option 3 i.e. RPSQ is the correct answer.
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