What is true of the interest cost component of the pension expense? 

 IFRS specifies that enterprises should use the yields on medium-quality corporate bonds. 

It represents the increase in the pension obligation due to the passage of time.

ASPE specifies that enterprises should use a yield that matches the plan's return on pension assets for the period. 

 IFRS specifies that enterprises should use the yields on high-quality short-term corporate bonds. 

 It represents the time value earned on pension plan assets.