What is the relation between the normal reaction acting on a surface and the limiting friction on the surface?

Options

A. `mu=F_(r)-N`
B. `mu=F_(r) xx N`
C. `mu=F_(r) // N`
D. none of these

Explanation

To understand the relationship between the normal reaction acting on a surface and the limiting friction on that surface, we can break down the concepts step by step.

### Step-by-Step Solution:

1. **Define Normal Reaction (N)**:
The normal reaction is the force exerted by a surface to support the weight of an object resting on it. It acts perpendicular to the surface.

2. **Define Limiting Friction (F)**:
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