What is a good example of a programming error that Bob can use to explain to the management how encryption will not address all their security concerns?

Bob has a good understanding of cryptography, having worked with it for many years.
Cryptography is used to secure data from specific threats, but it does not secure the application
from coding errors. It can provide data privacy; integrity and enable strong authentication but it
cannot mitigate programming errors. What is a good example of a programming error that Bob can
use to explain to the management how encryption will not address all their security concerns?

A.
Bob can explain that using a weak key management technique is a form of programming error

B.
Bob can explain that using passwords to derive cryptographic keys is a form of a programming
error

C.
Bob can explain that a buffer overflow is an example of programming error and it is a common
mistake associated with poor programming technique

D.
Bob can explain that a random number generator can be used to derive cryptographic keys but
it uses a weak seed value and this is a form of a programming error