The retention times of a sample containing substances A and B in a 45 cm long column were (A) 24.40 min, respectively; (B) 25.80 min. The retention time of a substance not retained in this column is 1.20 minutes. Widths of the peaks (W) of types A and B: 1.17 minutes for A; For B it is 1.27 minutes. According to this:

a) Type B retention (capacity) factor,

b) Selectivity factors of A and B species,

c) the separation power of the column (Rs),

d) the number of type A layers in the column,

e) Layer height taking into account type A,

calculate. Indicate whether the magnitudes of the numerical values obtained in each option are chromatographically appropriate.