Which of the following are features of blank verse?

a poem written in unrhymed iambic pentameter
a poem in 14 lines with a strict rhyme pattern
a poem without rhyme or regular meter
a poem intended to be sung rather than spoken

" A poem written in unrhymed iambic pentameter " is the option that constitutes a feature of a blank verse.

A blank verse refers to a type of verse which lack rhyme. It is usually written in iambic pentameter. Shakespeare was the writer who used to write in blank verse.

Blank verse is poetry written with regular metrical but unrhymed lines, almost always in iambic pentameter. It has been described as "probably the most common and influential form that English poetry has taken since the 16th century."

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that’s the kind of bug henry was; and if we’d a had him along ’stead of our kings, he’d a fooled that town a heap worse than ourn done.”