Column initially is saturated with solute at concentration \(\mathrm{c}_{\text {init }}>0\). Feed is \(\mathrm{c}_{\mathrm{F}}=0\).

1. If solute follows a linear isotherm, the resulting solute wave will be

(a) diffuse wave,

(b) shock wave,

(c) simple wave.

2. If solute follows a favorable isotherm, the resulting solute wave will be

(a) diffuse wave,

(b) shock wave,

(c) simple wave.

3. If solute follows an unfavorable isotherm, the resulting solute wave will be

(a) diffuse wave,

(b) shock wave,

(c) simple wave.