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: Let   $$x = 64 + 96 + 128 + 160 + 288 + 352 + 3232.$$ Which of the following statements are true?

A. $x$ is a multiple of $4$.
B. $x$ is a multiple of $8$.
C. $x$ is a multiple of $16$.
D. $x$ is a multiple of $32$.

Answer as a list of letters in alphabetical order, separated by commas.  For example, if you think A and C are the true statements, then answer ``A,C" (without the quote marks).
user