Dr. Amina Al-Zaidi, a renowned linguist specializing in Semitic languages, is leading a project to digitize a collection of ancient Arabic medical texts for international scholarly access. The project requires strict adherence to ISO 233:1984 for transliteration. One particular manuscript contains numerous instances of the word \"مَرْض\" (disease). A junior member of Dr. Al-Zaidi\'s team, Omar, initially transliterates it as \"marad\". However, Dr. Al-Zaidi corrects him, emphasizing the importance of accurately representing the short vowel \"a\" (represented by the diacritic *fatha*) and the emphatic consonant \"ض\" (*dad*). Furthermore, the manuscript contains several instances of the name \"سعيد\" (Sa\'id). Omar initially transliterates this as \"Said,\" a common but potentially inaccurate representation.\n\nConsidering the principles of ISO 233:1984, which prioritizes phonetic accuracy and the accurate representation of diacritics and emphatic consonants, and given the need for scholarly precision in the digitization project, what would be the MOST accurate transliteration of \"مَرْض\" (disease) and \"سعيد\" (Sa\'id) according to ISO 233:1984?