An audio signal of bandwidth 4 kHz is sampled at a rate 25% above the Nyquist rate and quantized. The quantization error is not to exceed 0.1% of the signal peak amplitude. The resulting quantized samples are now coded and transmitted by 4-ary pulses. (a) Determine the minimum number of 4-ary pulses required to encode each sample. (b) Determine the minimum transmission bandwidth required to transmit this data with zero ISI.