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Determine the correctness or otherwise of the following Assertion [$a$] and the Reason [$r$].

Assertion [$a$]: Dam methylase protects $E$. coli $DNA$ from phage endonucleases

Reason [$r$]: $E$. coli Dam methylase methylates the adenosine residue in the sequence "$GATC$"

  1. Both [$a$] and [$r$] are true and [$r$] is the correct reason for [$a$]
  2. Both [$a$] and [$r$] are true but [$r$] is not the correct reason for [$a$]
  3. Both [$a$] and [$r$] are false
  4. [$a$] is false but [$r$] is true
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