Final answer:
In a presidential form of government, the head of the executive branch is elected independently from the legislative branch and serves a fixed term, with the US President as a prime example. Option a.
Step-by-step explanation:
In a presidential form of government, the head of the executive branch is elected independently from the legislative branch and serves a fixed term. This separation of powers ensures that the legislative and executive branches operate independently.
In the United States, for example, the President is the head of the executive branch and serves a four-year term. The President is elected indirectly through the Electoral College, heads the executive branch of the federal government, and assumes the role of commander-in-chief of the United States Armed Forces.
Furthermore, the President has the authority to appoint members of the executive cabinet, oversee major bureaucratic departments, and influence foreign and domestic policies.
So Option a is correct.