Which statements on classical cryptography fundamentals are correct

$$ In the One$-$Time Pad scheme the key to encrypt is the same key to decrypt messages.

$$ Cryptographically secure pseudo random numbers generators' unpredictability is generally based on ciphers or other cryptographic methods $($e$.$g$.$ hashes$)$ or on hard $($asymmetric$)$ mathematical problems.

$$ Practical stream ciphers do not distribute the truly random key, but rather independently generate the keys with pseudo random numbers generators $($e$.$g$.$ linear congruential generator, LCG$)$ sharing the same seed $($a much smaller random number$),$ which becomes a key much simpler to distribute, however compromising the unconditional security of the OTP.

$$ In simplified terms a field is a set of numbers in which one can add, subtract and multiple but not divide.