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: The second and fourth terms of a geometric sequence are 2 and 6. Which of the following is a possible  first term? Type the letter of the correct option.

A. $-\sqrt{3}$

B. $-\frac{2\sqrt{3}}{3}$

C. $-\frac{\sqrt{3}}{3}$

D. $\sqrt{3}$

E. $3$
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