MECP between the T2 and T3 states

Questions
#1

Dear support group,

      In the below example, While performing the MECP  between S0 and S1 at the SF-TDDFT level why are they considering the triplet  multiplicity in the $molecule section?

$molecule
0 3
C -0.015889 0.073532 -0.059559
C 0.012427 -0.002468 1.315694
H 0.857876 0.147014 -0.710529
H -0.936470 -0.011696 -0.626761
H 0.764557 0.663381 1.762573
H 0.740773 -0.869764 1.328583
$end
$rem
JOBTYPE opt
MECP_OPT true
MECP_METHODS penalty_function
METHOD bhhlyp
SPIN_FLIP true
UNRESTRICTED true
BASIS 6-31G(d,p)
CIS_N_ROOTS 4
MECP_STATE1 [0,1]
MECP_STATE2 [0,2]
CIS_S2_THRESH 120
$end
If i want to find out MECP between the T2 and T3 states, whether we need to consider the triplet or singlet ?

#2

It’s spin flip so the reference state has one unit higher spin multiplicity than the target states, hence triplet reference for singlet targets. For triplet (S=1) targets, reference should be S=2 (quintet).