Which of the following is / are correct about Charle’s law ?

Charles law states that “Pressure remaining constant, the volume of a fixed mass of a gas is directly proportional to its absolute temperature”.

$\mathrm{V\alpha T}\left(\mathrm{At} \mathrm{constant} \mathrm{p} \mathrm{and} \mathrm{n}\right)$

$=\frac{\mathrm{V}}{\mathrm{T}}= \mathrm{constant}$

${\left[\frac{\mathrm{\delta v}}{\mathrm{\delta T}}\right]}_p=cons\tan t$