A bit string is a string of $0$s or $1$s$.$

a$)$ There are

bit strings that are length $1.$

b$)$ There are

bit strings that are length $2$ or less.

c$)$ There are

bit strings that are length $3$ or less.

d$)$ There are

bit strings that are length $4$ or less.

e$)$ There are

bit strings that are length $5$ or less.

f$)$ There are

bit strings that are length $6$ or less.

g$)$ There are

bit strings that are length $7$ or less.

h$)$ There are

bit strings that are length $8$ or less.