What does the entry 3/day mean if several spell-like/psi-like abilities are listed?

I am preparing an encounter involving a psionic Yuan-Ti Abomination. The entry in the XPH lists under the section psi-like abilities:

3/day—body purification (6 points*), psionic charm (all targets, 1 day/level, DC 19*), concealing amorpha, deeper darkness, mind thrust (ML 7th, 7d10, DC 18*), psionic suggestion (four targets, DC 16*); (XPH, p. 218)

Does that mean the Yuan-Ti can manifest

a) each psi-like ability listed here 3/day,

b) a total of three manifestations of abilities in this list, including using the possibility to use one ability three times

c) three abilites out of this list once each

A similar issue arises with the spell-like abilities in the gnome entry in PHB, where it says:

1/day—dancing lights, ghost sound, prestidigitation.

Does this mean gnomes can use each of these abilities once, or only one of these?