Segmentation genes in Drosophila are divided into three groups (gap, pair rule and segment polarity) based on their mutant phenotype. Below are some of the major genes expressed in a sequential manner (with respect to the groups) affecting segmentation pattern.

P. Hairy→ paired→ tailless →patched.

Q. Hunchback →even-skipped→ fushi tarazu→ wingless.

R. Odd-skipped →giant →paired →wingless

S. Tailless →hairy →fushi tarazu →gooseberry.

Which of the above sequence(s) of genes expressed from early to late embryo is/are correct?