Questions 3-8 On each day of the Monday through Friday workweek，exactly two of three employees-George， Hilda， and Irene-must remain on duty in the office to answer tele-phones during the noon to 1 p.m. lunch break. In the scheduling of telephone duty the following constraints must be met： Hilda and Irene have telephone duty together on

　　Tuesday. George and Hilda have telephone duty together on

　　Thursday.No one can have telephone duty on more than four of thefive days of the week.

　　3.Which of the following can be the week's telephone duty schedule？ Monday Tuesday Wednesday Thursday Friday

　　（A） George  George  Hilda  George  Hilda Hilda  Irene Irene  Hilda  Irene

　　（B） George  Hilda George  Hilda  George Hilda   Irene Hilda  Irene  Irene

　　（C） George  Hilda George  George  George Irene  Irene Hilda  Hilda  Hilda

　　（D） Hilda   Hilda George George  HildaIrene  Irene Hilda Hilda  Irene

　　（E） Hilda  Hilda George George  George Irene  Irene Hilda Irene  Irene

　　4.If Hilda has telephone duty for exactly two days of the week， which of the following must be true？

　　（A）George and Irene have telephone duty together on Wednesday.

　　（B）George and Hilda have telephone duty togetheron Friday.

　　（C）Hilda and Irene have telephone duty together on Wednesday.

　　（D）Hilda and Irene have telephone duty together on Friday.

　　（E）Irene has telephone duty for exactly three days of the week.