SEO: Knowledge base and community referencing in search engines

Hello,

We are working on SEO and would like to analyse how well our client portal knowledge base and community forums are referenced by search engines.

To start analysing some search engines (for example Yandex) require to confirm the rights for the website.

There are the following options to confirm the rights:

1) Insert the code in <head>.

2) Put the following html file with the following content in the root catalog of the website

yandex_111222333444.html:

   <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body>Verification: 111222333444</body> </html>

3) Add the following DNS TXT-record for the domain https://support.marketmixer.net :

   yandex-verification: 111222333444

Unfortunately I cannot use any of the above.

The easiest option is option 3 but we cannot use because according to RFC rules, if there is a CNAME-record for a domain, then it is not possible to add other records. And there is a CNAME as this is the only way to attach our own domain to Zoho Desk.

What would you recommend?