Read the situation below and select the best answer for each of the questions that follow. An employee has been assigned the task of allotting offices to six of the staff members. The offices are numbered 1-6. The offices are arranged in a row and they are separated from each other by six foot high dividers. Hence voices, sounds and cigarette smoke flow easily from one office to another. Ms. Ruby needs to use the telephone quite often throughout the day. Mr. Milon and Mr. Belal need adjacent offices as they need to consult each other often while working. Ms. Helen is a senior employee and has to be allotted the office number 5, having the biggest window. Mr. Didar requires silence in the offices next to his. Mr. Tutul, Mr. Milon and Mr. Didar are all smokers. Ms. Helen is allergic to tobacco smoke and wants the offices next to hers to be occupied by non-smokers. Unless specifically stated all the employees maintain an atmosphere of silence during office hours. In the event of which occurrence, within a period of one month since the assignment of the offices, would a request for a change in office be put forth by one or more employees?