Which of the following descriptions of the characteristics of $1-$D DPCM is not correct?

Question $1$ options:

A higher$-$order predictor does not necessarily always perform better than a lower$-$order predictor.

Click this as your best answer if all the descriptions are correct.

The reduction of quantization step size results in an increase of SNR as well as an increase in bit rate.

DPCM performances vary among different signals.

A sufficiently high predictive order should be used to meet a specified SNR at an affordable bit rate.