A is true. There is no vertical line that can intersect this graph twice.
B is false. The function is defined for all
.
C is true. The minimum value of
is 
.
D is false. The piecewise function is made of one semicircle and one line, just two functions.
E is also false. The circular arc is a nonlinear function.
Thus, the answer is A and C.
B is false. The function is defined for all
C is true. The minimum value of
D is false. The piecewise function is made of one semicircle and one line, just two functions.
E is also false. The circular arc is a nonlinear function.
Thus, the answer is A and C.