What other factors in addition to occupancy-days are likely to affect the variation in electrical costs from month to month? (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer. Any boxes left with a question mark will be automatically graded as incorrect.) a. Systematic factors like guests, switching off fans and lights. b. unchecked Number of days present in a month. c. unanswered Income taxes paid on hotel income. d. unanswered Seasonal factors like winter or summer. e. unanswered Fixed salary paid to hotel receptionist.