Pressure on a fluid is:

Pressure on a fluid behaves according to the principles of fluid mechanics. When fluid is contained in a closed system, such as a pipe, the pressure is indeed distributed equally at the same horizontal level in the fluid, barring any external forces, gravity changes, or friction losses. This is due to the incompressible nature of fluids in most common scenarios, leading to the principle that at a given depth, the pressure is the same throughout.

In a static fluid, pressure increases with depth due to the weight of the fluid above, but at the same horizontal plane, the pressure exerted by the fluid is uniform. This concept is critical in various applications such as hydraulics, where understanding fluid pressure distribution is essential for system design and analysis.

The other choices might suggest various states of pressure in relation to the inlet, but they do not correctly capture the fundamental behavior of pressure in a static fluid. This knowledge is crucial for understanding fluid dynamics and engineering applications.