Some parts of a sentence have been jumbled up, and labelled P, Q, R and S. Select the option that gives the correct sequence in which these parts can be rearranged to form a meaningful and grammatically correct sentence.

After the shank was

P. the bolster was placed

Q. driven into the bolster,

R. into a die that squeezed

S. the rings into the grooves

and wings of the shank.