Which of the following should the permission settings be for /etc/passwd and /etc/shadow?

Which of the following should the permission settings be for /etc/passwd and /etc/shadow?

A.
/etc/passwd: -rw-r–r– /etc/shadow: -r——–B. /etc/passwd: -r——– /etc/shadow: -rw-r–r–C. /etc/passwd: -rw-r–r– /etc/shadow: -rw-r–r–D. /etc/passwd: -r——– /etc/shadow: -r——–}