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What is the order of accuracy of the Lax-Wendroff technique?

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What is the order of accuracy of the Lax-Wendroff technique?

(a) fourth-order

(b) third-order

(c) first-order

(d) second-order

I have been asked this question in my homework.

The question is from Finite Difference Methods in section Finite Difference Methods of Computational Fluid Dynamics

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The correct option is (d) second-order

Easiest explanation: The Lax-Wendroff technique is second order accurate in both space and time. The first term in the truncation error has an order 2. This order of accuracy makes the algebra behind the technique complex.

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