What Was the Decision of the Supreme Court in Keshavanand

What was the decision of the Supreme Court in Keshavanand Bharati case?

A) Parliament is supreme in the matters of legislation
B) In matters relating to compulsory acquisition of private property the court had the ultimate powers of determining what is public purpose under Article 31
C) The power under Article 368 to amend the Constitution cannot be so exercised as to alter the basic structure or the essential features of the Constitution
D) The Supreme Court has full authority to pronounce on the Constitutional Validity of any State law