
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
Given a circle C: $x^2 + y^2 - 2x + 4y - 4 = 0$.
(1) Write down the standard equation of circle C and indicate the coordinates of the center and the radius;
(2) Determine if there exists a line m with a slope of 1 such that m intersects circle C at chord AB, and $OA \perp OB$ (where O is the origin). If it exists, find the equation of line m; if not, explain why.

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