In a reaction

reagents 'X' and 'Y' respectively are:

A

$$(\text{CH}_3\text{CO})_2\text{O}/\text{H}^+$$ and $$\text{CH}_3\text{OH}/\text{H}^+, \Delta$$

B

$$(\text{CH}_3\text{CO})_2\text{O}/\text{H}^+$$ and $$(\text{CH}_3\text{CO})_2\text{O}/\text{H}^+$$

C

$$\text{CH}_3\text{OH}/\text{H}^+, \Delta$$ and $$\text{CH}_3\text{OH}/\text{H}^+, \Delta$$

D

$$\text{CH}_3\text{OH}/\text{H}^+\Delta$$ and $$(\text{CH}_3\text{CO})_2\text{O}/\text{H}^+$$