The correct options are
A The Prime Minister is the Head of State
D Certain powers of the Judiciary are exercised by the Executive
The Westminster system is another name for a Parliamentary model of government. The name is derived from the Palace of Westminster in the United Kingdom, where the Model Parliament was held in the year 1295. In a Parliamentary Democracy, the Head of State is the President or a constitutional monarch. The Prime Minister is the Head of Government. The Judiciary is an independent body, and is not influenced by the Legislature or the Executive.