In HTML, table-related tags include:

• <table> → Defines a table.
• <thead> → Defines the header section of a table.
• <tr> → Defines a table row.
• <td> → Defines a table cell (data cell).

Why other options are incorrect?

• (B) colspan, table, tr → colspan is an attribute, not a tag.
• (C) table, tt, tr, td → <tt> (teletype text) is not a table tag.
• (D) none of the mentioned → Incorrect because option (A) contains valid table tags.

Thus, option (A) is the correct answer.