Let $A = \{ (x,\,y):y = {e^x},\,x \in R\} $, $B = \{ (x,\,y):y = {e^{ - x}},\,x \in R\} .$ Then

  • A

    $A \cap B = \phi $

  • B

    $A \cap B \ne \phi $

  • C

    $A \cup B = {R^2}$

  • D

    None of these

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