The regular expression .[89]00.[0-9]{3}.[0-9]{4} is designed to match a specific phone number format. Let's break down the pattern:

.: Matches any character, zero or more times.

[89]: Matches a single character that must be either '8' or '9'.

00: Matches the literal characters '00' immediately following the '8' or '9'.

.: Matches any separating characters (like a hyphen).

[0-9]{3}: Matches exactly three digits.

.: Matches any separating characters.

[0-9]{4}: Matches exactly four digits.

Only option A, "800-123-4567", satisfies the crucial condition of having an '8' or '9' immediately followed by '00'.

B. 901-123-4567: This is incorrect because the '9' is followed by '01', not the required '00'.

C. 701-123-4567: This is incorrect because the number does not start with an '8' or '9' as required by the [89] character set.

D. 808-123-4567: This is incorrect because the '8' is followed by '08', not the required '00'.

E. 809-123-4567: This is incorrect because the '8' is followed by '09', not the required '00'.

1. Micro Focus UFT One Help Center (v. 15.0.2), "Regular expression character and operator reference". This official documentation defines the operators used:

. (dot): "Matches any single character except a newline."

: "Matches the preceding character or sub-expression zero or more times."

[abc]: "Matches any one of the enclosed characters."

{n}: "Matches exactly n times."

2. Microsoft VBScript Documentation, "Pattern Property (RegExp)". As UFT One utilizes the VBScript engine, this source is authoritative. It confirms the syntax for character matching ([89]), quantifiers ({3}), and wildcards (., ).

3. MIT OpenCourseWare, "6.0002 Introduction to Computational Thinking and Data Science, Fall 2016", Lecture 5: "Stochastic Thinking". Section on "Regular Expressions" explains the fundamental syntax, confirming that [89] matches '8' or '9' and [0-9]{3} matches any three-digit sequence. This validates the universal interpretation of the regex components.