B.R. Ambedkar played a pivotal role in shaping the Indian Constitution.  Among the following statements regarding his contributions and the features of the Constitution, which are CORRECT?

(a) Ambedkar championed a socialist economic system and advocated incorporating it directly into the Constitution.
(b) The Constitution incorporates a federal system with a strong central government to ensure national unity.
(c) Ambedkar, though the Chairman of the Drafting Committee, faced significant opposition to his ideas during the Constituent Assembly debates.
(d) The Constitution enshrines Fundamental Rights as justiciable rights, enforceable by the courts.