Suppose that xa(t) is bandlimited to 7 KHz, then what is the over sampling for xat)? O a. 14 KHz O b. 8 KHz O c. 4 KHz O d. 16 KHz What is the folding frequency of the system, the sampling period of the A/D is 5 ms; where the input is xa(t) = 5 cos 50nt +2 sin 100nt. O a. 25 Hz O b. 50 Hz O c. 200 Hz O d. 100 Hz Anti-aliasing filter ensure that are no frequency components greater than entering the system O a. 2/fs O b. 2fs O c. fs/2 O d. 2fmax