Who were Ashaab-e-Sufah?

a) Muhajirs (RA) who stayed near the Masjid-e-Quba
b) Muhajirs (RA) who stayed near the Masjid-e-Nabavi
c) Ansaar (RA) who stayed near the Masjid-e-Nabavi
d) Ansaar (RA) who stayed near the Masjid-e-Quba