Identify the following type of reaction :

$\text{2KC}l{\text{O}}_3\underset{\text{Catalyst}}{\overset{\text{Heat}}{\to }}2\text{KC}l\left(\text{s}\right)+3{\text{O}}_{\text{2}}\left(\text{g}\right)$

It is a decomposition reaction and is endothermic in nature

It is a decomposition reaction and is accompanied by release of heat

It is a photochemical decomposition reaction and exothermic in nature

It is a combination reaction