Evaluate the following constitutional provisions to determine which ones structurally enforce India's status as a Secular State:
1. The DPSP directive mandating the state to endeavor to secure a Uniform Civil Code for all citizens.
2. The constitutional requirement that mandatory religious instruction be impartially provided in all state-maintained educational institutions.
3. The fundamental right ensuring every religious denomination possesses the autonomy to manage its own religious affairs.
4. The fundamental right stipulating that citizens cannot face discrimination on the grounds of religion regarding state employment.