Given the Accompanying Table Where Numbers 1 Through 4 Indicate Four Supplements That Must

Given the accompanying table:
$\begin{array}{lcccc} \underline {\text { Supplement } } \\&1 & 2 & 3 & 4 \\\hline \text { Strain A } &+ & - & + & - \\ \text { Strain B } &+ & + & + & - \\ \text { Strain C } &+ & + & + & + \\ \text {Strain D } &- & - & + & -\end{array}$ Where numbers 1 through 4 indicate four supplements that must be added to sustain growth of the organism.Determine a possible metabolic pathway that would give the results seen for the four mutant strains,A through D.