Analyze the relationship between 'Direct Line' and 'Insurance' within the context of the input sentence.
Options: brand, product/material produced, legal form, director/manager

Admiral Group became FTSE 100 leader with a 65p, or 4.5pc, gain to £15.18, RSA Insurance rose 2.2pc to 440.2p, Direct Line advanced 0.7pc to 359.1p and mid-cap insurer Esure climbed 1.9pc to 269.3p.
product/material produced