What is the relationship between 'Samsung' and 'shipbuilding' in the context of the input sentence.
Options: operator, platform, product/material produced, distribution format

Daewoo Shipbuilding, the No.3 shipbuilding company, posted the largest operating loss of USD2.6 billion in the quarter, followed by the No.2 shipbuilder Samsung Heavy with USD1.34 billion.
product/material produced