persistent Company Programming Database

A tree was given with nodes assigned clours red, blue, yellow, green and more that one node is
having colour red.They have asked that how many times the output will be red if the total number of
evaluation is 11.

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persistent Other Question

There is a file server which provides locking for mutual exclusion . if any process locks the file and abruptly terminated this will result in indefinitely locking .
The solution they found is to implement a timer for locking of file i.e. if time outs then server assumes that file is indefinitely locked and terminate the process ?
a) this solution is perfect for mutual exclusion
b) this will solve indefinite locking
c) this will result in interleaving of file between processes
d) will allow the concurrent process to access the file.