A signal $m(t)$ with a maximum frequency less than 10 kHz is sampled by multiplying it by an ideal impulse train consisting of delta functions separated by 50 us to generate the
sampled signal $m_s(t)$. Which of the following filters should be used to recover $m(t)$ from $m_s(t)$?
O A
High-pass filter with a cutoff frequency of 10 kHz
OB
High-pass filter with a cutoff frequency of 20 kHz
OC
Low-pass filter with a cutoff frequency of 10 kHz
OD Low-pass filter with a cutoff frequency of 20 kHz