Choose the packing that results from the use of the first$-$fit $($FF$)$ bin$-$packing algorithm to pack the following weights into bins that can hold no more than $8lb.$

$5lb,7lb,1lb,2lb,4lb,5lb,1lb,1lb,3lb,6lb,2lb$

a$.$

b$.$

c$.$

d$.$

a

b

c

d