$9.$Low Risk$$ does not require additional procedures for after$-$hours work. Which activities are regarded as low risk work? $($select all that apply$)$

a$.$ Lectures and tutorials

b$.$ Desk work in an office

c$.$ Desk work in a laboratory

d$.$ Desk work in a lab where there is no lab work underway

e$.$ Use of low risk laboratory equipment e$.$g$.$ microscopes