
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 a situation where no preventive measures are taken, the probability of a certain emergent event occurring is 0.3, which, if it happens, will lead to a loss of 4 million yuan. There are two independent preventive measures available, A and B, which cost 0.45 million yuan and 0.3 million yuan respectively when applied alone. With the respective preventive measures in place, the probability of the emergent event not occurring increases to 0.9 and 0.85. If the prevention plan allows for either measure A or B to be used alone, both in conjunction, or neither, determine the preventive plan that minimizes the total cost. (Total cost = cost of taking preventive measures + the expected value of the loss from the emergent event occurring).)

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