A 4-tube seriаl dilutiоn is prepаred per the fоllоwing procedure: а. 1mL of saline (diluent) is added to every tube. b. 1mL of patient specimen is added to tube 1 and mixed. c. 1 mL of tube 1 is transferred to tube 2 and mixed. d. 1 mL of tube 2 is transferred to tube 3 and mixed. e. 1 mL of tube 3 is transferred to tube 4 and mixed. f. 1mL of tube 4 is removed and discarded. g. 0.5 ml of sensitized (Ag coated) latex beads are added to every tube. h. Following incubation, it is found that tubes 1-4 have agglutinated. What is the patient's antibody titer? EXPLAIN your answer. Answers lacking adequate explanation will not receive credit.