To answer this question, let's go through each term individually:

1. sin 90: The sine of 90 degrees is equal to 1.

2. cos 90: The cosine of 90 degrees is equal to 0.

3. tan 90: The tangent of 90 degrees is undefined. It approaches infinity as the angle approaches 90 degrees.

Now let's calculate the given expression:

sin 90 + cos 90 + tan 90 = 1 + 0 + infinity

Since infinity is not a finite number, the correct answer is F.

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