Observer a Sees a Ruler Moving by in a Relativistic $L A < L _ { B }$

Multiple Choice

Observer A sees a ruler moving by in a relativistic rocket and measures its length to be LA. Observer B moves along with the rocket and measures the length of the ruler to be LB. What is true
About these two length measurements?

A) $L A < L _ { B }$
B) $L _ { A } > L _ { B }$
C) $L _ { A } = L _ { B }$
D) $L _ { A }$ could be greater or smaller than $L _ { B }$ depending on the direction of the motion.