
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
An ellipse (C) has its foci on the y-axis, an eccentricity of $ \frac { \sqrt {3}}{2}$, and a distance from the upper focus to the upper vertex of $2- \sqrt {3}$.
(I) Find the standard equation of ellipse (C);
(II) A line (l) intersects ellipse (C) at points P and Q. O is the coordinate origin, and the area of $ \triangle OPQ$ is 1. Determine whether $ | \overrightarrow{OP}|^{2}+| \overrightarrow{OQ}|^{2}$ is a constant value. If it is, find the constant value; if not, explain the reason.

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