Which of the following statements is/are true?

a. Only types of interactions between particles of noble gases are due to weak dispersion forces.
b. The ionization enthalpy of molecular oxygen is very close to that of xenon.
c. Hydrolysis of XeF6 is a redox reaction.
d. Xenon fluorides are not reactive.

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)