In a Presidential System of Government, members of the Executive are not members of either House of the Legislature. This means that they are not required to hold a seat in the legislative branch in order to serve in the executive branch.

Option 1 is incorrect because it suggests that members of the Executive are drawn from both the Houses of the Legislature. However, in a Presidential System, the executive branch operates separately from the legislative branch, and its members are not necessarily chosen from the legislative body.

Option 2 is also incorrect because it states that members of the Executive are only from the popular House. In a Presidential System, the Executive is not limited to only one House of the Legislature.

Option 4 is incorrect because it suggests that members of the Executive become members of the Legislature after their appointment. However, in a Presidential System, the Executive and Legislative branches are separate entities, and members of the Executive do not automatically become members of the Legislature.

The correct answer is option 3, which states that members of the Executive under a Presidential System of Government are not members of either House of the Legislature.