MCQ

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$A)$ Heat transfer by conduction and convection require a material medium. $B)$ Heat transfer by radiation doesn't require a material medium:

• ✓
  Both $A$ and $B$ are true
• B
  $A$ is true but $B$ is false
• C
  $B$ is true but $A$ is false
• D
  Both $A$ and $B$ are false