The mechanism of Sn1 reaction is given as: R - X ⟶ R ^ ⊕ X ^ ⊖ ⟶ R...

The mechanism of Sn1 reaction is given as:

$R - X ⟶ {R}^{⊕}{X}^{⊖} ⟶ {R}^{⊕} ‖ {X}^{⊖}\overset{{Y}^{⊖}}{⟶}R - Y + {X}^{⊖}lonpairSolventSpeparatedionpair$

A student writes general characteristics based on the given mechanism as :
(a) The reaction is favoured by weak nucleophiles.
(b) ${R}^{⊕}$ would be easily formed if the substituents are bulky $y$
(c) The reaction is accompanied by recemization
(d) The reaction is favoured by non-polar solvents.

Which observations are correct?