Time remaining: $40$ minutes $34$ seconds

Question $19)$ When using access equipment the HSE recommend that ladders $\_\_\_\_\_\_\_\_\_\_\_\_\_.$

a$)$ should never be used, only tower scaffolds are permittedb$)$ should be used to access safe platforms $($tower scaffold$)$c$)$ should be used if the task will take less than $30$ minutesd$)$ can be used for light work