
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Determine the intervals of $x$ for which the expression $(x+1)(x-1)(x-3)$ is positive.
A) $(-\infty, -1) \cup (1, 3)$
B) $(-1, 1) \cup (1, 3)$
C) $(-1, 1) \cup (3, \infty)$
D) $(1, \infty)$

Present the answer in LaTex format: \boxed{Your answer}
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