
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
For any four real numbers $a$, $b$, $c$, and $d$, with $b\neq c$ and $d \neq 0$, the operation $\otimes$ is defined by:
\[\otimes(a,b,c,d)=\frac{a+d}{b-c}\]
Calculate $\otimes(\otimes(1,2,3,1), \otimes(2,3,4,1), \otimes(3,4,5,1), \otimes(4,5,6,1))$.
A) -6
B) -7
C) -8
D) -9

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