What does "Grounded" imply about an aircraft's functionality?

The term "Grounded" indicates that an aircraft is unable to take off at that moment. This can be due to various reasons such as mechanical issues, regulatory compliance, safety concerns, or simply being out of service for maintenance. When an aircraft is referred to as grounded, it means that it is not operational and cannot reach the skies, which is critical information for both the airline's operational planning and the passenger's travel arrangements. The other options describe states of readiness or completion rather than an inability to operate.