Answer:
(Fatwa: 103/105=B)
(1) & (2) We do not have any knowledge about the matter.
(3) One can recite any dua after every tarweeha (four rakat). However, according to Allama Shami the abovementioned dua also can be recited thrice:
قال القھستانی فیقال ثلاث مرات سبحان ذی الملک الخ کما فی منھج العباد قبل ادراک الفریضۃ فی باب الوتر والنوافل (شامی، 3/497)
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
