Correct option is D
Conduction and convection require a medium for the transfer of heat:
·
Conduction occurs through direct molecular interactions within a material or between two contacting materials.
·
Convection involves the bulk motion of a fluid (liquid or gas) to transfer heat.
In a
vacuum, there is no medium (neither solid, liquid, nor gas) to facilitate conduction or convection. Hence, only
radiation, which involves electromagnetic waves, can transfer heat through a vacuum.
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