The "CPT Symmetry" in quantum field theory asserts that:
a) The combined operations of charge conjugation (C), parity transformation (P), and time reversal (T) leave physical laws invariant, meaning these transformations do not change the fundamental physics of a system.
b) The laws of physics are unchanged under time reversal alone.
c) Particles are identical to their antiparticles.
d) The interaction between particles and antiparticles is symmetric under charge conjugation.