Which of the following is a complex-compound sentence?
Select one:
a. I got the salad ready, and Liam grilled the chicken.
b. I got the salad ready, and Liam, who is my cousin, grilled the chicken.
c. While I got the salad ready, Liam grilled the chicken.
d. I got the salad ready, while my cousin Liam grilled the chicken.
please help me out ASAP