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Explanation:

Considering the options,

On Monday, windows W1 and W4 were open at 9:45 AM.

On Wednesday, windows W1, W2 and W5 were open at 9:45 AM.

On Thursday, windows W1 and W2 were open at 9:45 AM.

On Friday, only W2 was open at 9:45 AM.

Hence, option (b).

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