Final answer:
The primary source of information about an applicant's identity is generally found in the application form, where personal details are first recorded and which may be later used for verification against state records or in background checks.
Step-by-step explanation:
The principal source of information concerning an applicant's identity, age, and marital status is typically found in the application form. This form is often the first document where applicants provide personal information to affirm their identity and eligibility, similar to when citizens apply to vote and must supply their name, address, and other identifying details. Providing precise information within these forms is crucial as it might be used for cross-referencing with state records or conducting background checks. When considering the broader context of information gathering, it's important for individuals to understand why information is being collected, how it will be utilized, and who will have access to it to protect their identity from being compromised. In employment or other legal circumstances, the Civil Rights Act of 1964 ensures the protection of applicants from discrimination based on personal characteristics, thereby influencing which details can or cannot be asked for legally on these application forms. These forms are a primary tool for employers, agencies, or authorities to establish the applicant's credentials.