The disadvantages of a single-platform application from the options provided are:
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Exposure of the application is limited. - Since the application is designed for a single platform, its reach and user base are restricted to that platform only.
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The performance of the application is not optimized for the platform. - This could be a disadvantage if the application does not leverage the specific features and capabilities of the platform to provide optimal performance.
The third option, “There may be compatibility issues when a file is shared on the same platform,” is less accurate in the context of single-platform applications, as typically, applications on the same platform should generally have compatibility when sharing files.
Thus, the most appropriate disadvantage is “Exposure of the application is limited.”