Which manager from the list below $($Matthew$,$ Kathy, Seema, or neither one$)$ is likely to be in the most vulnerable position in terms of informal power?

$1$ point

a$.$ Matthew$$s two key contacts, on whom he depends greatly for information and political support $$ Aysha and Samir $$ depend on Matthew very little

b$.$ Kathy$$s two key contacts, on whom she depends greatly for information and political support $$ Leonard and Krista $$ also depend on Kathy greatly for information.

c$.$ Seema$$s two key contacts, on whom she depends greatly for information and political support $$ Nicholas and Marina $$ depend on Seema to a moderate degree.

d$.$ Neither manager