David sometimes brings hard boiled eggs for lunch at work, which several of his coworkers do not enjoy the smell of. One day at work, David and his coworkers discussed how they could best share the break room space. They decided that on days David brought in hard boiled eggs he would eat them in his office rather than in the break room.

The stock of grommet corporation, a u. s. company, is publicly traded, with no single shareholder owning more than 5 percent of its outstanding stock. grommet owns 95 percent of the outstanding stock of staple inc., also a u. s. company. staple owns 100 percent of the outstanding stock of clip corporation, a canadian company. grommet and clip each own 50 percent of the outstanding stock of fastener inc., a u. s. company. grommet and staple each own 50 percent of the outstanding stock of binder corporation, a u. s. company. which of these corporations form an affiliated group eligible to file a consolidated tax return?