Which of these commands allows you to use shared libraries that are in /usr/local/lib?

Which of these commands allows you to use shared libraries that are in /usr/local/lib?

A.
export LD_PRELOAD=/usr/local/lib

B.
export LD_UBRARY_PATH=/usr/local/lib
C Idconfig/usr/local/lib
D.ldd/usr/local/lib