Give the line-angle structure and the IUPAC name of the compound described below:
An 8-membered cycloalkane with the molecular formula C₉H₁₈.

Line-angle structure of methylcyclooctene, an 8-membered cycloalkane.

Line-angle structure of ethylcycloheptane, an 8-membered cycloalkane.

Line-angle structure of methylcyclooctane, an 8-membered cycloalkane.

Line-angle structure of methylcycloheptene, an 8-membered cycloalkane.

Give the line-angle structure and the IUPAC name of the compound described below:An 8-membered cycloalkane with the molecular formula C9H18.