4. Synthetic slings must be inspected __ a. the first time they are ever used b. before every use c. every fifth time they are used d. by sight only

## Step 1<br />This problem is about the correct procedure for inspecting synthetic slings. The options provided are:<br />a. the first time they are ever used<br />b. before every use<br />c. every fifth time they are used<br />d. by sight only<br /><br />## Step 2<br />The correct answer is "b. before every use". This is because safety regulations require that all equipment, including synthetic slings, be inspected before each use. This is to ensure that the equipment is in good working condition and safe to use.<br /><br />## Step 3<br />The other options are not correct. Option "a" suggests that the sling should only be inspected the first time it is used, which is not sufficient as the sling could degrade or become unsafe over time. Option "c" suggests that the sling should only be inspected every fifth time it is used, which is also not sufficient as the sling could degrade or become unsafe between uses. Option "d" suggests that the sling should only be inspected by sight, which is not sufficient as the sling could be damaged or unsafe even if it looks fine.