Correct Answer - Option 2 : 1

__Concept:__

Degree of Freedom: The degree of freedom (DOF) of a mechanical system is the number of independent variables required to define the position or motion of the system.

**For a simple mechanism, the degree of freedom (F) is given by the Gruebler’s criterion:**

**F = 3 (n - 1) - 2j - h**

Where j = number of revolute joints

n = number of links

h = number of higher pairs

__Calculation:__

**Given:**

n = 8, j = 10, h = 0

F = 3 (8 - 1) - 2 × 10 - 0

F = 21 - 20 = 1