Need help in anatomy ?

Question

the iliac crest is at the level of

a.S-3,4,5

b.L-1

c.L-4

d.S-1

thanks

Answer 1

4th lumbar vertebra. L-4

Answer 2

is at the level of L4, L1 is high and  the sacrum(S1 S2 S3 S4 S5) is under the iliac crest