Number of primary equations of motion is ___

Number of primary equations of motion is ___
 
(a) 1
 
(b) 2
 
(c) 3
 
(d) 4
 
This question was posed to me in an international level competition.
 
This interesting question is from Kinematic Equations for Uniformly Accelerated Motion topic in division Motion in a Straight Line of Physics – Class 11
Select the correct answer from above options 
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