Marissa researched the cost to have custom t-shirts printed by several local and online vendors. she found that each store’s charge for the job could be modeled by a linear function that combined a flat charge for artwork with a per t-shirt rate. marissa plotted the functions on a coordinate grid and found that two of the functions produced lines that had the same y-intercept. how should marissa interpret this result?

a: those two vendors charge the same rate per shirt.
b: those two vendors charge the same flat rate for artwork.
c: those two vendors will have the same total cost to produce one shirt.
d: those two vendors will charge the same total cost for any size job.