Punctuating an Introductory Clause

Very Hard Standard English Conventions Punctuation

Read the following sentence:

When I finally met the author of my favorite book I was surprised to discover that she was nothing like how I had imagined her to be.

Which of the following options correctly punctuates this sentence?

When I finally met the author of my favorite book, I was surprised to discover that she was nothing like how I had imagined her to be.

When I finally met the author of my favorite book I was surprised, to discover that she was nothing like how I had imagined her to be.

When I finally met the author of my favorite book: I was surprised to discover that she was nothing like how I had imagined her to be.

When I finally met the author of my favorite book; I was surprised to discover that she was nothing like how I had imagined her to be.

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