Which version is used to solve conjugate gradient method of the algorithm of symmetric matrices?

Which version is used to solve conjugate gradient method of the algorithm of symmetric matrices? Correct Answer Fletcher-Reeves version

We generally present Fletcher-Reeves version of the algorithm of the symmetric matrices in Conjugate gradient method. This method is of algorithm model and also as an iterative method. Conjugate gradient method is unstable with respect to even small perturbations.
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