Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: Which of the following functions have inverses?  Note that the domain of each function is also given.

A. $a(x) = \sqrt{2 - x},$ $x \in (-\infty,2].$

B. $b(x) = x^3 - x,$ $x \in \mathbb{R}.$

C. $c(x) = x + \frac{1}{x},$ $x \in (0,\infty).$

D. $d(x) = 2x^2 + 4x + 7,$ $x \in [0,\infty).$

E. $e(x) = |x - 2| + |x + 3|,$ $x \in \mathbb{R}.$

F. $f(x) = 3^x + 7^x,$ $x \in \mathbb{R}.$

G. $g(x) = x - \frac{1}{x},$ $x \in (0,\infty).$

H. $h(x) = \frac{x}{2},$ $x \in [-2,7).$

Enter the letters of the functions that have inverses, separated by commas.  For example, if you think functions $b(x)$ and $e(x)$ have inverses, enter "B, E" without the quotation marks.
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