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Which of the following statements about immune response are $CORRECT$?

  1. $T$ cells are activated by antigen-presenting cells
  2. Foreign peptides are not presented to helper $T$ cells by Class $II$ $MHC$ proteins
  3. Dendritic cells are referred to as professional antigen- presenting cells
  1. $P$ and $R$ only 
  2. $P$ and $Q$ only
  3. $Q$ and $R$ only 
  4. $P, Q$ and $R$
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