Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to assemble a surface mounted printed circuit board [title] Compile your components. [step] Ensure that you have all the components and the equipment needed to perform the assembly. Check whether each component has been given a reference designator.

Ending1: Before assembling an enclosed circuit board, consult an online listings database for relevant information about the component you will be assembling. Some materials to consider include : [substeps] Circuit boards loose electrode drives or clips [title] Opt for irregular shapes. Ending2: [title] Measure and mark the areas that you will need to rebuild. [step] Also make sure that each area covered is at a correct depth. Ending3: This is usually provided by the component supplier. It will help you to speed up the assembly process and reduce mistakes. Ending4: If one component does not, add or subtract more information until you have the required required components to perform your assembly. These components can be found separately from the components and equipment portion.

Answer format: ending1/ending2/ending3/ending4