Consider the following statements regarding differential pulse-code modulators:

1. The differential pulse-code modulator system employs a predictor.

2. It needs far fewer bits per each error sample than what would have been needed for the original samples themselves.

3. It will have larger dynamic range than the original message itself.

Select the correct statements using the code given below, 

Differential pulse-code modulators:

• The DPCM module implements one of the simplest compression algorithms.
• It combines a spatial prediction loop with a non-uniform quantizer of which the representation levels are Huffman encoded.
• It is a signal encoder that uses PCM but adds some functionalities based on the prediction of the samples of the signal.
• The input to the DPCM can be an analog or digital signal.
• The number of encoded bits is smaller than in the PCM system.
• It needs far fewer bits per error sample than what would have been needed for the original samples themselves.
• This results in fewer bandwidth requirements by the DPCM system and hence has a lower dynamic range than the original message itself.​

Hence, options 1 and 2 are correct.