What is the difference between primary and secondary securities$$ markets?

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Part $1$

A$.$

Securities transactions in the primary market are handled on the trading$$ floor; in the secondary$$ market, they are handled through nonexchange trading.

B$.$

Only the securities of U$.$S$.$ companies are traded in the primary$$ market; the secondary market is for the trading of international$$ companies' securities$.$

C$.$

New securities are sold in the primary$$ market; existing securities are sold in the secondary market.

D$.$

The primary market is for the highest rated securities$$ available; smaller, less$$ well$-$known securities are traded in the secondary market.

E$.$

The primary market is for buying$$ securities; the secondary market is for selling them.