composition says most master cylinder reservoirs are made of composite plastic. Technician B says the master cylinder reservoir cap keeps ambient moisture out of the hydraulic system. Who is correct? A) Technician A B) Technician B C) Both Technician A and B D) Neither Techniciar A or B

## Step 1<br />The problem presents two statements from Technician A and Technician B regarding the composition of master cylinder reservoirs and the function of the master cylinder reservoir cap.<br /><br />## Step 2<br />Technician A states that most master cylinder reservoirs are made of composite plastic. This is indeed true. The master cylinder reservoirs are typically made of composite plastic because it is lightweight, durable, and resistant to corrosion.<br /><br />## Step 3<br />Technician B claims that the master cylinder reservoir cap keeps ambient moisture out of the hydraulic system. This is also correct. The cap of the master cylinder reservoir is designed to prevent moisture from entering the hydraulic system, which could lead to corrosion and other issues.<br /><br />## Step 4<br />Since both Technician A and Technician B's statements are correct, the answer is C) Both Technician A and B.