Could someone help me with this? I changed my major to computer science abd I am having a hard time putting it togetger.

a$)(5)$ Is this a combinational circuit or is it a sequential circuit? Explain your answer.

b$)(5)$ If $S=0,$ show the value for each of the $4$ outputs if initially $I_3,I_2,I_1{I}_0=1111.$

$O_3=$

$O_2=$

$O_1=$

$O_0=$

c$)(5)$ If $S=1,$ show the value for each of the $4$ outputs if initially $I_3,I_2,I_1{I}_0=1011.$

$O_3=$

$O_2=$

$O_1=$

$O_0=$