
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
In the event of a sudden incident, the probability of it occurring without any preventive measures is 0.3, and if it occurs, it will result in a loss of 4 million yuan. There are two independent preventive measures available, A and B. The costs of implementing measures A and B are 450,000 yuan and 300,000 yuan, respectively, and the probabilities of the incident not occurring after implementing the respective measures are 0.9 and 0.85. If the prevention plan allows for the individual or combined use of measures A and B, or not using them at all, please determine the prevention plan that minimizes the total cost. (Total cost = cost of preventive measures + cost of losses due to the incident)

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