Class that one of his members is object

Lets say I have class called Connection. One of his members is object that is instance of another class, class VerificationCode.

The class VerificationCode has 2 members: code and expiresAt.

Should I keep the VerificationCode and associate it with the member, or should I associate the 2 members code and expiresAt directly to the Connection class?

What are the advantages or disadvantages in terms of design/modeling?

Example:

Option 1:

Class VerificationCode{
code: string;
expiresAt: number;
}

Class Connection{
a: string;
verificationCode: VerificationCode;
}

Option 2:

Class Connection{
a: string;
code: string;
expiresAt: number;
}