That depends on the system of government. In a monarchy or Dictatorship it will be the head of state. In some systems it will be a democratically elected head of state. In a constitutional monarchy or presidency, like the UK's, it will be the head of state's representative, the prime minister in most cases.
The Cabinet.
to advise the President.
Executive
Andrew Jackson noted for having a kitchen cabinet to advise him.
Cabinet
To advise the president on certain issues.
To advise him
There are 15 cabinet departments. There are also several cabinet-level officers including the Vice-President that advise the President as well.
The people are known as the president's cabinet and they are the cabinet secretaries .
The main function of the Cabinet is to advise the President on important national and international issues
The role of the Cabinet in policy making is dependent on the President. The Cabinet's role is to advise the President. -Phillip Lorio
to advise the President.