In the Kolbe electrolysis of sodium propanoate, the products X and Y are fomed at respected electrodes. What are X and Y ?

$\mathrm{X}={\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_3\text{ at Cathode; }$ Y = H₂ at Anode

$\mathrm{X}={\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3\text{ at Anode; }$ Y = H₂ at Cathode

$\mathrm{X}={\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$ at Cathode; Y = H₂ at Anode

$\mathrm{X}={\mathrm{CH}}_3-{\mathrm{CH}}_3\text{ at Anode; }$ Y = H₂ at Cathode