Question: What people did the rycerstwo class represent?

Is "Representing the wealthier families of Poland and itinerant knights from abroad seeking their fortunes, this other class of rycerstwo, which became the szlachta/nobility ("szlachta" becomes the proper term for Polish nobility beginning about the 15th century), gradually formed apart from Mieszko" the correct answer?
OPT:
[a]. yes;
[b]. no;
[a].