Which is the correct sequence in the following properties? For the correct order mark (T) and for the incorrect order mark (F): 

(a) bond angle order : $N{H}_{3 }<P{H}_3<As{H}_3<Sb{H}_3$

(b) Melting point : ${\mathrm{NH}}_3>{\mathrm{SbH}}_3>{\mathrm{AsH}}_3>{\mathrm{PH}}_3$

(c) Boiling point : ${\mathrm{NH}}_3>{\mathrm{SbH}}_3>{\mathrm{AsH}}_3>{\mathrm{PH}}_3$

(d) Bond dipole order : ${\mathrm{NH}}_3>{\mathrm{SbH}}_3>{\mathrm{AsH}}_3>{\mathrm{PH}}_3$