R3(X); R2(Y), W4(X), W3(Z); R1(Y); R1(Z); W2(Y); W1(A) Using the above schedule, insert shared locks, exclusive locks, and unlock actions. Place a shared lock immediately in front of each read action that is not followed by a write action of the same element by the same transaction. Place an exclusive lock in front of every other read or write action. necessary unlocks at the of every transaction. U(r) - UNLOCK; SL(r) - SHARED LOCK; XL(r) - EXCLUSIVE LOCK ... where r is the element. (upload file types: doc, docx, pdf, jpg, gif, png, xls, xlsx - please no apple based files)