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How will ∫^e^x⁄x look like, in MATLAB?

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How will ∫^e^x⁄x look like, in MATLAB?

(a) Infinite series

(b) expint(x)

(c) ei(x)

(d) Error

I had been asked this question in class test.

My enquiry is from Integration in chapter Beyond the Basics of MATLAB

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The correct answer is (c) ei(x)

The best I can explain: The integration of the given function is stored in MATLAB as ei(x) or exponential integration of x. This yields a solution of an exponentially increasing series. Hence, even though it becomes an infinite series, it will be represented as ei(x) whenever we come across such an integration.

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