Analyze the relationship between 'Teck Resources' and 'coal' within the context of the input sentence.
Options: developer, founded by, product/material produced, stock exchange

Our analysts have initiated coverage on the coal industry with focus on the following companies: Vale S.A. ( VALE ), Peabody Energy Corporation ( BTU ), Teck Resources Limited ( TCK ), Arch Coal Inc. ( ACI ), and Rio Tinto PLC ( RIO ).
product/material produced