Select two of the following roles performed by U. S. president:

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Chief Executive-As Chief Executive the president can: implement policy, supervise the executive branch of government, prepare executive budget for submission to congress, and appoint and remove executive officials. The head of government is the chief officer of the executive branch of a government, often presiding over a cabinet.

Commander in Chief-A commander-in-chief or supreme commander is the person who exercises supreme command and control over an armed forces or a military branch. As a technical term, it refers to military competencies that reside in a country's executive leadership, a head of state or a head of government.

Explanation:

a is the final ! : )