
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 the probability of a sudden event occurring without any preventive measures is 0.3, and it will cause a loss of 4 million yuan if it happens. There are two independent preventive measures, A and B, available. The cost of implementing preventive measures A and B is 450,000 yuan and 300,000 yuan respectively. After implementing preventive measures A and B, the probability of this sudden event not occurring is 0.9 and 0.85 respectively. If the preventive scheme allows implementing either A, B, both, or none, determine the preventive scheme that minimizes the total cost. (Total cost = cost of preventive measures + expected loss from the sudden event occurring.)

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