Final answer:
The condition required for deadlock to be possible is all of the mentioned. Deadlock occurs when a set of processes are unable to proceed because they are blocked, waiting for resources held by other processes.
Step-by-step explanation:
The condition required for deadlock to be possible is all of the mentioned. Deadlock occurs when a set of processes are unable to proceed because they are blocked, waiting for resources held by other processes. In order for deadlock to occur, all four conditions mentioned in the options must be satisfied.
Mutual exclusion is the condition that states only one process can access a resource at a time. If multiple processes simultaneously try to access the same resource, deadlock can occur.
A process may hold allocated resources while awaiting assignment of other resources. This condition can lead to a situation where each process is holding onto resources needed by other processes, resulting in a deadlock.
The condition that no resource can be forcibly removed from a process holding it is known as the hold and wait condition. If a process is holding a resource and is also waiting for another resource, deadlock may occur if the requested resource cannot be forcibly taken from the holding process.
So, all of the mentioned conditions: mutual exclusion, a process may hold allocated resources while awaiting assignment of other resources, and no resource can be forcibly removed from a process holding it are required for deadlock to be possible.