Drones are used on construction sites to __ a. survey construction and monitor hazards deliver important messages to craft professional a track workers and monitor their hours d. ensure construction is built to code

## Step 1<br />The problem is asking us to identify the correct use of drones on construction sites. The options provided are:<br />a. survey construction and monitor hazards<br />b. deliver important messages to craft professional<br />c. track workers and monitor their hours<br />d. ensure construction is built to code<br /><br />## Step 2<br />We need to evaluate each option based on the known uses of drones in construction.<br /><br />## Step 3<br />Option a, "survey construction and monitor hazards", is a known use of drones in construction. Drones can be used to survey the construction site and monitor potential hazards.<br /><br />## Step 4<br />Option b, "deliver important messages to craft professional", is not a known use of drones in construction. Drones are not typically used for communication purposes.<br /><br />## Step 5<br />Option c, "track workers and monitor their hours", is not a known use of drones in construction. Drones are not typically used for tracking workers or monitoring their hours.<br /><br />## Step 6<br />Option d, "ensure construction is built to code", is not a known use of drones in construction. Drones are not typically used to ensure that construction is built to code.