According to the standards of the profession, which of the following activities may be required in exercising due professional care?

$\backslash$table$[[,\backslash$table$[[$Consulting$],[$with Experts$]],\backslash$table$[[$Obtaining Specialty$],[$Accreditation$]]],[$A$.,$Yes,Yes$],[$B$.,$Yes,No$],[$C$.,$No$,$Yes$],[$D$.,$No$,$No$]]$