The correct statement(s) about the compound

${\mathrm{H}}_3\mathrm{C}\left(\mathrm{OH}\right)\mathrm{HC}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}\left(\mathrm{OH}\right){\mathrm{CH}}_3\left(\mathrm{X}\right)$ is / are

• A

  The total number of stereoisomers possible for (X) is 6.

• B

  The  diastereomers are not possible for (X) 

• C

  the total optically active isomers will be 4

• D

  If double bond in (X) is cis, the number of enantiomers possible for (X) is 2.