34. let s be the upper hemisphere of the unit sphere x + y +z =1 lf da is upward pointing nomal vector, then the value of xei - 3xfe"j) lies in interval (a)-2-1

34. Let S be the upper hemisphere of the unit sphere x + y +z =1 lf dA is upward pointing nomal vector, then the value of xei - 3xfe"j) lies in interval (a)-2-11 (b) [-1 2] osoeC)0, 1 (d)-3. 11n str