A teacher shall retain but not accrue seniority if the teacher is:
a) On leave of absence in excess of 30 calendar days;
b) Laid off for a period of time less than that set out in Article 15.10 (c) hereof;
c) Absent because of illness or accident for more than the maximum number of days accumulated under the provisions of the collective agreement;
d) Sabbatical leave;
e) Absent because the Division has granted more maternity and/or parental leave than required by the Employment Standards Code.