Identify the total number of substituents present in the given compound.

What is the $IUPAC$ name of the following compound?

Given below are two statements:
Statement $I$: $IUPAC$ name of $HO-CH_2-(CH_2)_3-CH_2-COCH_3$ is $7-$hydroxyheptan$-2-$one.
Statement $II$: $2-$oxoheptan$-7-$ol is the correct $IUPAC$ name for above compound.
In the light of the above statements,choose the most appropriate answer from the options given below:

The $IUPAC$ name of the compound shown in the image is:

The $IUPAC$ name of the compound $CH_2 = CH - CH(CH_3) - CH_3$ is

$IUPAC$ name of the compound: