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Which of these is the oldest method for numerical solution of partial differential equations?

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Which of these is the oldest method for numerical solution of partial differential equations?

(a) Finite Element Method

(b) Finite Difference Method

(c) Finite Volume method

(d) Spectral Element Method

I got this question during an interview.

My question is taken from Numerical Methods topic in chapter Numerical Methods of Computational Fluid Dynamics

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Correct option is (b) Finite Difference Method

Explanation: The Finite Difference Method is the oldest method for solving partial differential equations numerically. It is believed that this method is developed by Euler in the 18th century. This is the easiest method too.

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