What is the $IUPAC$ name for isophthalic acid?

What is the $IUPAC$ name of the compound $CH_3COCH(CH_3)_2$?

The $IUPAC$ name of $CH_2=CH-CH_2-COOH$ is

What is the common name of $2, 3$-dihydroxybutanedioic acid?

The $IUPAC$ name of the compound shown below is:
$H_2C-CH-CH_3$ (with an oxygen atom bridging the first two carbons)

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: