The direct material (DM) cost of a product is \\( \\$ 4 \\) less than twic the cost of the direct labour (DL) and the overhead \\( (\\mathrm{OH}) \\) is 5 / of the direct labour cost. What is the equation of DM in terms of DL? a. \\( \\mathrm{DM}=5 / 6 \\mathrm{DL}-4 \\) b. \\( \\mathrm{DM}=5 / 6 \\mathrm{DL}+4 \\) c. \\( \\mathrm{DM}=2 \\mathrm{DL}-4 \\) d. \\( \\mathrm{DM}=2 \\mathrm{DL}+4 \\)