Theoretical Vs Practical Ciphers

What are true statements about ciphers with perfect secrecy?
It can never have key length shorter than the message length (bitwise encryption)
If each key is equally probable then it has perfect secrecy
It only applies for bitwise encryptions
What are the true statements about cryptanalytic attacks?
Attacker needs to know one or more pairs for known plaintext attack
One time pad is vulnerable to known plaintext attacks
In known plaintext attack, attacker has access to cipher to encrypt any plaintext
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