Identify the precise constitutional section that houses the explicit mandate instructing individuals 'to develop scientific temper, humanism and the spirit of inquiry and reform':
1. The introductory Preamble, which outlines the philosophical objectives of liberty and fraternity for the republic.
2. The non-justiciable framework of Fundamental Duties, which outlines the moral and intellectual obligations owed by citizens to the nation.
3. The justiciable framework of Fundamental Rights, designed to guarantee freedom of conscience and intellectual expression.