The sales management team requires that the Lead Source field of the Lead record be populated when a Lead is converted. What would a developer use to ensure that a user populates the Lead Source field prior to converting a Lead?

A. Validation rule

Explanation:

Validation rules can be used to ensure that fields are populated because they can verify if the data being inputted meet the requirements of the administrators by returning a 'True' or 'False' response after testing. If the result is false, the user will be unable to move on until they adjust the field.

For example, Field length checks on websites are a Validation rule where you are only allowed to input a set number of characters and anything less or more will be denied, such as in the case of inputting phone numbers.

By including a Validation Rule that the LeadSource field of the Lead record be populated when a Lead is converted, the developer will be able to make sure that a user populates the Lead Source field prior to converting a Lead.

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.