For a cracked window screen (inner or outer pane but not both), which operating condition is specified?

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When a window pane is cracked, the aircraft can still fly, but the damage imposes limits to keep the event safe and give time to repair. The best-supported operating condition is to continue flight for a limited time, stay below a specified altitude, and keep the cabin pressure difference within a restricted range. Specifically, you may operate for less than 25 hours, at or below flight level 250, with the cabin differential pressure limited to between 2.0 and 4.6 psi. Staying under FL250 reduces the external pressure and the load on the cracked pane, while keeping the pressure differential within a modest range minimizes the stress on the damaged window. The 25-hour window provides a maintenance-driven deadline to replace the pane.

The other options imply extremes not supported by the restriction: flying with no pressurization, operating normally without limits, or being always allowed would ignore the extra risk the crack introduces and is not consistent with safe maintenance procedures.