In four separate experiments (Table), a vector $DNA pBxyz\left(6000\mathrm{bp}\right)$ and a $DNA-X \left(1500 \mathrm{bp}\right)$ fragment was digested with the indicated restriction enzymes. Both, the digested vector and $DNA-X$were purified and ligated. $Am{p}^r$ represents the ampicillin resistant gene and Ori is the origin of replication. The resultant recombinant vector was transformed into Escherichia coli cells and incubated in a liquid nutrient medium with ampicillin for $24$ hours at $37°\mathrm{C}$. Based on the restriction enzymes used for cloning, choose the correct option.

Experiment No.	Restriction enzymes used
1	BamHI and SalI
2	EcoRI and SalI
3	KpnI and HindIII
4	KpnI and SalI