Identify the conceptual definition that most accurately encapsulates the political science doctrine of 'Fabian Socialism':
1. A radical doctrine advocating the immediate and aggressive dismantling of capitalist structures via violent revolutionary uprisings.
2. A reformist ideology dedicated to the incremental implementation of egalitarian economic policies utilizing established, peaceful democratic mechanisms.
3. An ecological framework demanding the absolute prioritization of natural resource protection over all forms of industrial production.
4. A decentralized economic model relying heavily on unregulated market forces and unhindered private enterprise.