Given the log with four transactions on Solmaris database shown below, answer questions

$\backslash$table$[[$Transaction ID$,$Time,Action,Record Updated,Sofore lnnge$,$After lmage$],[1,10$:$00,$Start,,,$],[2,10$:$01,$Start,,,$],[1,10$:$02,$Insert,ServiceRequest $(14),,($new values$)],[3,10$:$03,$Start,,,$],[2,10$:$04,$Update,Location $(2),($old values$),($new values$)],[3,10$:$05,$Update,Owner $($FE$182),($old values$),($new values$)],[1,10$:$06,$Commit,s$,,],[4,10$:$07,$Start,,,$],[3,10$:$08,$Update,CondoUnit $(5),($old values$),($new values$)],[3,10$:$09,$Commit,,,$],[2,10$:$10,$Update,CondoUnit $(5),($old values$),($new values$)],[2,10$:$11,$Commitat,,,$],[4,10$:$12,$Update,CondoUnit $(5),($old values$),($new values$)],[4,10$:$13,$Update,Owner $($FE$182),($old values$),($new values$)],[4,10$:$14,$Commit,,,$]]$

a$.$ Suppose a catastrophe destroys the database just after $10$:$07.$ Which transactions would the recovery program use to update the restored backup? Which transactions would have to be requested by the users again? Why?

b$.$ Suppose a catastrophe hang up the database just after $10$:$09.$ All data are not affected but the database program stopped running. After restart, which transactions would the recovery program roll back? Why?

c$.$ At this moment there is NO deadlock in the database. Can you reorder some of the steps in the log to create a deadlock? Which transactions will be involved in the deadlock?